RHSA-2026:22878
Vulnerability from csaf_redhat - Published: 2026-06-03 14:53 - Updated: 2026-06-04 04:36Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
postgresql18:
* postgresql-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-contrib-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-docs-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-plperl-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-plpython3-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-private-devel-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-private-libs-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-server-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-server-devel-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-static-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-test-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-test-rpm-macros-18.4-0.1.hum1 (noarch)
* postgresql-upgrade-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql-upgrade-devel-18.4-0.1.hum1 (aarch64, x86_64)
* postgresql18-18.4-0.1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in PostgreSQL. An integer overflow in multiple server features allows an unprivileged database user to cause an undersized memory allocation that leads to an out-of-bounds write. This issue allows an attacker to execute arbitrary code as the operating system user running the database or, in applications that pass gigabyte-scale user inputs to the relevant database functions, to cause a segmentation fault, resulting in a denial of service.
8.8 (High)
Affected products
Fixed
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@src | — |
Vendor Fix
fix
Workaround
|
Known not affected
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@aarch64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@noarch | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@x86_64 | — |
Workaround
|
Threats
Impact
Important
A flaw was found in PostgreSQL. This vulnerability, an externally-controlled format string in the `timeofday()` function, allows a remote attacker to craft specific timezone zones. Successful exploitation can lead to the retrieval of sensitive portions of server memory, potentially disclosing confidential information.
4.3 (Medium)
Affected products
Fixed
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@src | — |
Vendor Fix
fix
Workaround
|
Known not affected
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@aarch64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@noarch | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@x86_64 | — |
Workaround
|
Threats
Impact
Moderate
A flaw was found in PostgreSQL. This vulnerability, related to symlink following in pg_basebackup (plain format) and pg_rewind, allows an origin superuser to overwrite local files. By exploiting this, an attacker could potentially hijack the operating system account. This attack has practical implications if specific actions are taken, such as moving files to a different virtual machine (VM) or snapshotting the VM, between the execution of these commands and the server's restart.
6.7 (Medium)
Affected products
Fixed
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@src | — |
Vendor Fix
fix
|
Known not affected
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@aarch64 | — | ||
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@noarch | — | ||
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@x86_64 | — |
Threats
Impact
Moderate
A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as lo_export(), lo_read(), lo_lseek64(), and lo_tell64(). This allows the superuser to send an arbitrarily large response, overwriting the client's stack memory, specifically in tools like psql and pg_dump. This could lead to arbitrary code execution on the client system.
8.4 (High)
Affected products
Fixed
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@src | — |
Vendor Fix
fix
Workaround
|
Known not affected
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@aarch64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@noarch | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@x86_64 | — |
Workaround
|
Threats
Impact
Important
A flaw was found in PostgreSQL. This vulnerability, a covert timing channel, exists in the comparison of MD5-hashed passwords during authentication. A remote attacker could exploit this to recover user credentials, gaining unauthorized access to the database. This issue specifically impacts databases that retain MD5-hashed passwords from upgrades of PostgreSQL 13 or earlier.
8.2 (High)
Affected products
Fixed
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@src | — |
Vendor Fix
fix
Workaround
|
Known not affected
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@aarch64 | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@noarch | — |
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:postgresql18-main@x86_64 | — |
Workaround
|
Threats
Impact
Important
References
34 references
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"name": "Integer Overflow or Wraparound"
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"text": "A flaw was found in PostgreSQL. An integer overflow in multiple server features allows an unprivileged database user to cause an undersized memory allocation that leads to an out-of-bounds write. This issue allows an attacker to execute arbitrary code as the operating system user running the database or, in applications that pass gigabyte-scale user inputs to the relevant database functions, to cause a segmentation fault, resulting in a denial of service.",
"title": "Vulnerability description"
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"text": "postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write",
"title": "Vulnerability summary"
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{
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"text": "To exploit this flaw, an attacker with minimal access to a database needs to pass extremely large inputs to vulnerable database functions, causing an integer overflow that leads to an out-of-bounds write. This flaw allows an attacker to potentially execute arbitrary code or, more likely, cause a denial of service.\n\nDefault Red Hat Enterprise Linux security features, including SELinux enforcement, Address Space Layout Randomization (ASLR) and NX (No-Execute) stack protection, significantly increase the difficulty of achieving arbitrary code execution, limiting the impact of this vulnerability.\n\nDue to these reasons, this vulnerability has been rated with an important severity.",
"title": "Statement"
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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},
{
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"url": "https://www.postgresql.org/support/security/CVE-2026-6473/"
}
],
"release_date": "2026-05-14T13:00:09.446000+00:00",
"remediations": [
{
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"date": "2026-06-03T14:53:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:22878"
},
{
"category": "workaround",
"details": "To mitigate this vulnerability, validate the length of data and the size of objects on all client APIs and web interfaces. Also, block, drop, or truncate oversized string, array, or binary objects before they are passed into backend SQL queries.",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
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"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "postgresql: integer overflow can cause an undersized allocation and an out-of-bounds write"
},
{
"cve": "CVE-2026-6474",
"cwe": {
"id": "CWE-134",
"name": "Use of Externally-Controlled Format String"
},
"discovery_date": "2026-05-14T14:01:28.018770+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
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"Red Hat Hardened Images:postgresql18-main@noarch",
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]
}
],
"ids": [
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"system_name": "Red Hat Bugzilla ID",
"text": "2477441"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in PostgreSQL. This vulnerability, an externally-controlled format string in the `timeofday()` function, allows a remote attacker to craft specific timezone zones. Successful exploitation can lead to the retrieval of sensitive portions of server memory, potentially disclosing confidential information.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "postgresql: PostgreSQL: Information disclosure via externally-controlled format string in timeofday() function",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
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],
"known_not_affected": [
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"references": [
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-6474"
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"category": "external",
"summary": "RHBZ#2477441",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477441"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-6474",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6474"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6474",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6474"
},
{
"category": "external",
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"url": "https://www.postgresql.org/support/security/CVE-2026-6474/"
}
],
"release_date": "2026-05-14T13:00:10.254000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-03T14:53:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:22878"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "postgresql: PostgreSQL: Information disclosure via externally-controlled format string in timeofday() function"
},
{
"cve": "CVE-2026-6475",
"cwe": {
"id": "CWE-59",
"name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
},
"discovery_date": "2026-05-14T14:01:20.040061+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2477439"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in PostgreSQL. This vulnerability, related to symlink following in pg_basebackup (plain format) and pg_rewind, allows an origin superuser to overwrite local files. By exploiting this, an attacker could potentially hijack the operating system account. This attack has practical implications if specific actions are taken, such as moving files to a different virtual machine (VM) or snapshotting the VM, between the execution of these commands and the server\u0027s restart.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and pg_rewind",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This MODERATE symlink following vulnerability in PostgreSQL\u0027s pg_basebackup and pg_rewind allows an origin superuser to overwrite local files. Exploitation requires local access, high privileges (superuser), and specific intermediate actions before server restart. Impact is high to confidentiality, integrity, and availability if exploited. Affects versions before 18.4, 17.10, 16.14, 15.18, and 14.23.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"known_not_affected": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-6475"
},
{
"category": "external",
"summary": "RHBZ#2477439",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477439"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-6475",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6475"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6475",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6475"
},
{
"category": "external",
"summary": "https://www.postgresql.org/support/security/CVE-2026-6475/",
"url": "https://www.postgresql.org/support/security/CVE-2026-6475/"
}
],
"release_date": "2026-05-14T13:00:11.039000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-03T14:53:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:22878"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 6.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "postgresql: PostgreSQL: Operating system account hijack via symlink following in pg_basebackup and pg_rewind"
},
{
"cve": "CVE-2026-6477",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-05-14T14:01:31.087667+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2477442"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in PostgreSQL libpq. A server superuser can exploit a buffer overflow vulnerability in the PQfn function, which is used by client functions such as lo_export(), lo_read(), lo_lseek64(), and lo_tell64(). This allows the superuser to send an arbitrarily large response, overwriting the client\u0027s stack memory, specifically in tools like psql and pg_dump. This could lead to arbitrary code execution on the client system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This IMPORTANT buffer overflow in PostgreSQL libpq allows a malicious server superuser to overwrite client stack memory via lo_* functions. Exploitation requires the victim to connect to a compromised or malicious server (UI:R). The scope is changed as the server attack affects the client system. Impact is high to confidentiality, integrity, and availability through potential client-side code execution. Affects versions before 18.4, 17.10, 16.14, 15.18, and 14.23.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"known_not_affected": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-6477"
},
{
"category": "external",
"summary": "RHBZ#2477442",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477442"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-6477",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6477"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6477",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6477"
},
{
"category": "external",
"summary": "https://www.postgresql.org/support/security/CVE-2026-6477/",
"url": "https://www.postgresql.org/support/security/CVE-2026-6477/"
}
],
"release_date": "2026-05-14T13:00:12.497000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-03T14:53:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:22878"
},
{
"category": "workaround",
"details": "Only connect to trusted PostgreSQL servers. Avoid using psql or pg_dump against untrusted or potentially compromised database servers.",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "postgresql: PostgreSQL libpq: Buffer overflow allows server superuser to overwrite client stack memory"
},
{
"cve": "CVE-2026-6478",
"cwe": {
"id": "CWE-385",
"name": "Covert Timing Channel"
},
"discovery_date": "2026-05-14T14:01:45.568001+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2477447"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in PostgreSQL. This vulnerability, a covert timing channel, exists in the comparison of MD5-hashed passwords during authentication. A remote attacker could exploit this to recover user credentials, gaining unauthorized access to the database. This issue specifically impacts databases that retain MD5-hashed passwords from upgrades of PostgreSQL 13 or earlier.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"known_not_affected": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-6478"
},
{
"category": "external",
"summary": "RHBZ#2477447",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477447"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-6478",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6478"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6478",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6478"
},
{
"category": "external",
"summary": "https://www.postgresql.org/support/security/CVE-2026-6478/",
"url": "https://www.postgresql.org/support/security/CVE-2026-6478/"
}
],
"release_date": "2026-05-14T13:00:13.174000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-03T14:53:52+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:22878"
},
{
"category": "workaround",
"details": "To mitigate this vulnerability, ensure that all PostgreSQL user passwords are not hashed using MD5. Users should migrate to stronger hashing algorithms such as `scram-sha-256`. This can be achieved by altering user passwords, which will automatically update their hash to the currently configured default. For example, to change a user\u0027s password: `ALTER USER username WITH PASSWORD \u0027new_password\u0027;` This action will require users to re-authenticate. If a service relies on these credentials, it may require a restart to pick up the new authentication details.",
"product_ids": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:postgresql18-main@aarch64",
"Red Hat Hardened Images:postgresql18-main@noarch",
"Red Hat Hardened Images:postgresql18-main@src",
"Red Hat Hardened Images:postgresql18-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "postgresql: PostgreSQL: Credential recovery via covert timing channel in MD5 password comparison"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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