ubuntu-cve-2026-71394
Vulnerability from osv_ubuntu
Published
2026-08-10 11:17
Modified
2026-08-10 11:17
Summary
Details
GNU Emacs for Android improperly validates the table header input in sfnt_read_table_directory() in src/sfnt.c. Due to an incorrect comparison variable in the read-length check, a crafted font file that claims to contain more table directory entries than actually present causes the parser to return a struct with uninitialized heap memory in the table directory entries. An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it. This leads to the use of uninitialized heap data in subsequent table lookups, potentially resulting in information disclosure, crashes, or arbitrary memory access on 32-bit targets. This issue is fixed after commit 7621ee1d01229d50e5c0cddea6bf0b01095a62cf
Severity
N/A (UNKNOWN)
References
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}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "xemacs21",
"purl": "pkg:deb/ubuntu/xemacs21@21.4.24-12build3?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"21.4.24-12build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xemacs21-basesupport",
"binary_version": "2009.02.17.dfsg.3-3build1"
},
{
"binary_name": "xemacs21-basesupport-el",
"binary_version": "2009.02.17.dfsg.3-3build1"
},
{
"binary_name": "xemacs21-mulesupport",
"binary_version": "2009.02.17.dfsg.3-3build1"
},
{
"binary_name": "xemacs21-mulesupport-el",
"binary_version": "2009.02.17.dfsg.3-3build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "xemacs21-packages",
"purl": "pkg:deb/ubuntu/xemacs21-packages@2009.02.17.dfsg.3-3build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2009.02.17.dfsg.3-3",
"2009.02.17.dfsg.3-3build1"
]
}
],
"aliases": [],
"details": "GNU Emacs for Android improperly validates the table header input in sfnt_read_table_directory() in src/sfnt.c. Due to an incorrect comparison variable in the read-length check, a crafted font file that claims to contain more table directory entries than actually present causes the parser to return a struct with uninitialized heap memory in the table directory entries.\u00a0An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it. This leads to the use of uninitialized heap data in subsequent table lookups, potentially resulting in information disclosure, crashes, or arbitrary memory access on 32-bit targets. This issue is fixed after commit\u00a07621ee1d01229d50e5c0cddea6bf0b01095a62cf",
"id": "UBUNTU-CVE-2026-71394",
"modified": "2026-08-10T11:17:00Z",
"published": "2026-08-10T11:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-71394"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-71394"
},
{
"type": "REPORT",
"url": "https://cert.pl/en/posts/2026/08/CVE-2026-71391"
},
{
"type": "REPORT",
"url": "https://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-71394"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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