ubuntu-cve-2026-34180
Vulnerability from osv_ubuntu
Published
2026-06-09 00:00
Modified
2026-07-08 20:55
Summary
Details
Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms. Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated. An integer truncation in OpenSSL's ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer. Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL's own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
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},
{
"binary_name": "ovmf",
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{
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{
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{
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{
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],
"priority_reason": "OpenSSL developers have rated this as being low severity"
},
"package": {
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"purl": "pkg:deb/ubuntu/edk2@2025.02-8ubuntu3.2?arch=source\u0026distro=questing"
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},
{
"ecosystem_specific": {
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{
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"binary_name": "openssl-provider-legacy",
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],
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},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "openssl",
"purl": "pkg:deb/ubuntu/openssl@3.5.3-1ubuntu3.4?arch=source\u0026distro=questing"
},
"ranges": [
{
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},
{
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],
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}
],
"versions": [
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},
{
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{
"binary_name": "efi-shell-x64",
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{
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{
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"name": "openssl",
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],
"aliases": [],
"details": "Issue summary: Parsing a crafted DER-encoded ASN.1 structure with a primitive element whose content exceeds 2 gigabytes in length may cause a heap buffer over-read on 64-bit Unix and Unix-like platforms. Impact summary: The heap buffer over-read may crash the application (Denial of Service) or to load into the decoded ASN.1 object contents of memory beyond the end of the input buffer. More typically such ASN.1 elements would instead be truncated. An integer truncation in OpenSSL\u0027s ASN.1 decoder causes the content length of an ASN.1 primitive element to be mishandled when it exceeds 2 gigabytes. In the worst case the truncated length is treated as a request to scan the binary content for a terminating zero byte, possibly causing OpenSSL to read either less than or beyond the end of the allocated buffer. Applications that pass attacker-supplied data to d2i_X509(), d2i_PKCS7(), or any other d2i_* decoding function are affected. OpenSSL\u0027s own command-line tools are not vulnerable, as data read through the BIO layer is checked before it reaches the affected code. The issue only affects 64-bit Unix and Unix-like platforms; 32-bit platforms and 64-bit Windows are not affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.",
"id": "UBUNTU-CVE-2026-34180",
"modified": "2026-07-08T20:55:18Z",
"published": "2026-06-09T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-34180"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34180"
},
{
"type": "REPORT",
"url": "https://openssl-library.org/news/secadv/20260609.txt"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8414-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8414-1"
}
],
"related": [
"USN-8414-2",
"USN-8414-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-34180"
]
}
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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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