SUSE-SU-2026:1843-1
Vulnerability from csaf_suse - Published: 2026-05-13 15:24 - Updated: 2026-05-13 15:24Summary
Security update for log4j
Severity
Moderate
Notes
Title of the patch: Security update for log4j
Description of the patch: This update for log4j fixes the following issues:
- CVE-2026-34477: TLS connections vulnerable to interception due to incomplete hostname verification configuration
checks (bsc#1262050).
- CVE-2026-34479: silent log event loss due to improper XML escaping in `Log4j1XmlLayout` (bsc#1262091).
- CVE-2026-34480: silent log event loss due to improper XML escaping in `XmlLayout` (bsc#1262092).
- CVE-2026-34481: silent log event loss due to improper serialization of non-finite floating-point values in
`JsonTemplateLayout` (bsc#1262093).
Patchnames: SUSE-2026-1843,SUSE-SLE-Module-Basesystem-15-SP7-2026-1843
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
6.5 (Medium)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
5.3 (Medium)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
6.5 (Medium)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
5.3 (Medium)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
References
20 references
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"title": "Description of the patch"
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"url": "https://www.suse.com/support/update/announcement/2026/suse-su-20261843-1/"
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"url": "https://lists.suse.com/pipermail/sle-updates/2026-May/046426.html"
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"url": "https://www.suse.com/security/cve/CVE-2026-34481/"
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"generator": {
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"product_tree": {
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},
"vulnerabilities": [
{
"cve": "CVE-2026-34477",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-34477"
}
],
"notes": [
{
"category": "general",
"text": "The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.html#log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName attribute of the \u003cSsl\u003e element.\n\nAlthough the verifyHostName configuration attribute was introduced in Log4j Core 2.12.0, it was silently ignored in all versions through 2.25.3, leaving TLS connections vulnerable to interception regardless of the configured value.\n\nA network-based attacker may be able to perform a man-in-the-middle attack when all of the following conditions are met:\n\n * An SMTP, Socket, or Syslog appender is in use.\n * TLS is configured via a nested \u003cSsl\u003e element.\n * The attacker can present a certificate issued by a CA trusted by the appender\u0027s configured trust store, or by the default Java trust store if none is configured.\nThis issue does not affect users of the HTTP appender, which uses a separate verifyHostname https://logging.apache.org/log4j/2.x/manual/appenders/network.html#HttpAppender-attr-verifyHostName attribute that was not subject to this bug and verifies host names by default.\n\nUsers are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue.",
"title": "CVE description"
}
],
"product_status": {
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"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
},
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{
"category": "external",
"summary": "CVE-2026-34477",
"url": "https://www.suse.com/security/cve/CVE-2026-34477"
},
{
"category": "external",
"summary": "SUSE Bug 1262050 for CVE-2026-34477",
"url": "https://bugzilla.suse.com/1262050"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
"version": "3.1"
},
"products": [
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"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-13T15:24:57Z",
"details": "moderate"
}
],
"title": "CVE-2026-34477"
},
{
"cve": "CVE-2026-34479",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-34479"
}
],
"notes": [
{
"category": "general",
"text": "The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.\n\nTwo groups of users are affected:\n\n * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file.\n * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class.\n\n\nUsers are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue.\n\nNote: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge.",
"title": "CVE description"
}
],
"product_status": {
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},
"references": [
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"category": "external",
"summary": "CVE-2026-34479",
"url": "https://www.suse.com/security/cve/CVE-2026-34479"
},
{
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"summary": "SUSE Bug 1262091 for CVE-2026-34479",
"url": "https://bugzilla.suse.com/1262091"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
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"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
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],
"scores": [
{
"cvss_v3": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
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"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-13T15:24:57Z",
"details": "moderate"
}
],
"title": "CVE-2026-34479"
},
{
"cve": "CVE-2026-34480",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-34480"
}
],
"notes": [
{
"category": "general",
"text": "Apache Log4j Core\u0027s XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets producing invalid XML output whenever a log message or MDC value contains such characters.\n\nThe impact depends on the StAX implementation in use:\n\n * JRE built-in StAX: Forbidden characters are silently written to the output, producing malformed XML. Conforming parsers must reject such documents with a fatal error, which may cause downstream log-processing systems to drop the affected records.\n * Alternative StAX implementations (e.g., Woodstox https://github.com/FasterXML/woodstox , a transitive dependency of the Jackson XML Dataformat module): An exception is thrown during the logging call, and the log event is never delivered to its intended appender, only to Log4j\u0027s internal status logger.\n\n\nUsers are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue by sanitizing forbidden characters before XML output.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-34480",
"url": "https://www.suse.com/security/cve/CVE-2026-34480"
},
{
"category": "external",
"summary": "SUSE Bug 1262092 for CVE-2026-34480",
"url": "https://bugzilla.suse.com/1262092"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
},
"products": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-13T15:24:57Z",
"details": "moderate"
}
],
"title": "CVE-2026-34480"
},
{
"cve": "CVE-2026-34481",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-34481"
}
],
"notes": [
{
"category": "general",
"text": "Apache Log4j\u0027s JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values (NaN, Infinity, or -Infinity), which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to index affected records.\n\nAn attacker can exploit this issue only if both of the following conditions are met:\n\n * The application uses JsonTemplateLayout.\n * The application logs a MapMessage containing an attacker-controlled floating-point value.\n\n\nUsers are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
},
"references": [
{
"category": "external",
"summary": "CVE-2026-34481",
"url": "https://www.suse.com/security/cve/CVE-2026-34481"
},
{
"category": "external",
"summary": "SUSE Bug 1262093 for CVE-2026-34481",
"url": "https://bugzilla.suse.com/1262093"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-javadoc-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-jcl-2.20.0-150200.4.33.1.noarch",
"SUSE Linux Enterprise Module for Basesystem 15 SP7:log4j-slf4j-2.20.0-150200.4.33.1.noarch"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-05-13T15:24:57Z",
"details": "moderate"
}
],
"title": "CVE-2026-34481"
}
]
}
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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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