Medium
emacs, emacs24 and 3 more products — security advisory
GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. 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 exposes heap memory contents which can be later used to defeat ASLR. This issue was fixed in commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe
- Products
- emacs, emacs24, emacs25, xemacs21, xemacs21-packages
- Affected versions
- 1:26.3+1-1ubuntu1, 1:26.3+1-1ubuntu2, 1:26.3+1-1ubuntu2+esm1, 1:26.3+1-1ubuntu2+esm2, 1:27.1+1-3ubuntu3, 1:27.1+1-3ubuntu5, 1:27.1+1-3ubuntu5.1, 1:27.1+1-3ubuntu5.2, 1:27.1+1-3ubuntu5.2+esm1, 1:29.1+1-5ubuntu1, 1:29.2+1-1ubuntu1, 1:29.2+1-2ubuntu4, 1:29.3+1-1ubuntu2, 1:29.3+1-1ubuntu2+esm1, 1:29.3+1-1ubuntu2+esm3, 1:29.3+1-1ubuntu2+esm4, 1:30.1+1-9ubuntu1, 1:30.2+1-11ubuntu1, 1:30.2+1-1ubuntu2, 1:30.2+1-2ubuntu1, 1:30.2+1-2ubuntu1+esm1, 1:30.2+1-6ubuntu1, 2009.02.17.dfsg.2-2, 2009.02.17.dfsg.2-4, 2009.02.17.dfsg.2-5, 2009.02.17.dfsg.3-2, 2009.02.17.dfsg.3-3, 2009.02.17.dfsg.3-3build1, 21.4.22-14ubuntu1, 21.4.22-4ubuntu3, 21.4.24-12, 21.4.24-12build2, 21.4.24-12build3, 21.4.24-4ubuntu1, 21.4.24-5ubuntu1, 21.4.24-8build1, 21.4.24-9, 21.4.24-9ubuntu2, 24.5+1-1ubuntu2, 24.5+1-1ubuntu4, 24.5+1-1ubuntu5, 24.5+1-1ubuntu6, 24.5+1-1ubuntu7, 24.5+1-6ubuntu1, 24.5+1-6ubuntu1.1, 24.5+1-6ubuntu1.1+esm1, 24.5+1-6ubuntu1.1+esm2, 24.5+1-6ubuntu1.1+esm3, 24.5+1-6ubuntu1.1+esm4, 25.2+1-6, 25.2+1-6ubuntu0.1~esm2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-71391
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:14 UTC · Revision 1
Source evidence
GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. 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 exposes heap memory contents which can be later used to defeat ASLR. This issue was fixed in commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe
osv:UBUNTU-CVE-2026-71391
emacs24
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
emacs25
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
emacs
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
emacs
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
emacs
Fixed versions: Not specified
emacs
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
xemacs21
Fixed versions: Not specified
xemacs21-packages
Fixed versions: Not specified
emacs
Fixed versions: Not specified
Complete source record
{
"id": "1d2fd5beaafa7140617a4ea6da19f5acefb742e14e99910a8393327c3bd15596",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-71391",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-71391",
"summary": "GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. 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 exposes heap memory contents which can be later used to defeat ASLR. This issue was fixed in commit 95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe",
"evidence": "osv:UBUNTU-CVE-2026-71391",
"products": [
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"name": {
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"evidence": "/affected/3/package/name"
},
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"affected_versions": [
{
"value": "25.2+1-6",
"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
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]
},
{
"name": {
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{
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"evidence": "/affected/4/versions"
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{
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]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
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"affected_versions": [
{
"value": "2009.02.17.dfsg.2-4",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "emacs",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:26.3+1-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "1:26.3+1-1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1:26.3+1-1ubuntu2+esm1",
"evidence": "/affected/6/versions"
},
{
"value": "1:26.3+1-1ubuntu2+esm2",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "xemacs21",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "21.4.24-8build1",
"evidence": "/affected/7/versions"
},
{
"value": "21.4.24-9",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "xemacs21-packages",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2009.02.17.dfsg.2-4",
"evidence": "/affected/8/versions"
},
{
"value": "2009.02.17.dfsg.2-5",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "xemacs21",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "21.4.24-9ubuntu2",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "xemacs21-packages",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2009.02.17.dfsg.2-5",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "emacs",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:27.1+1-3ubuntu3",
"evidence": "/affected/11/versions"
},
{
"value": "1:27.1+1-3ubuntu5",
"evidence": "/affected/11/versions"
},
{
"value": "1:27.1+1-3ubuntu5.1",
"evidence": "/affected/11/versions"
},
{
"value": "1:27.1+1-3ubuntu5.2",
"evidence": "/affected/11/versions"
},
{
"value": "1:27.1+1-3ubuntu5.2+esm1",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
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"evidence": "/affected/12/package/name"
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{
"value": "21.4.24-12",
"evidence": "/affected/12/versions"
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{
"value": "21.4.24-12build2",
"evidence": "/affected/12/versions"
},
{
"value": "21.4.24-12build3",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "xemacs21-packages",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
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{
"value": "2009.02.17.dfsg.3-2",
"evidence": "/affected/13/versions"
},
{
"value": "2009.02.17.dfsg.3-3",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "emacs",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1:29.1+1-5ubuntu1",
"evidence": "/affected/14/versions"
},
{
"value": "1:29.2+1-1ubuntu1",
"evidence": "/affected/14/versions"
},
{
"value": "1:29.2+1-2ubuntu4",
"evidence": "/affected/14/versions"
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{
"value": "1:29.3+1-1ubuntu2",
"evidence": "/affected/14/versions"
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{
"value": "1:29.3+1-1ubuntu2+esm1",
"evidence": "/affected/14/versions"
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{
"value": "1:29.3+1-1ubuntu2+esm3",
"evidence": "/affected/14/versions"
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{
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"evidence": "/affected/14/versions"
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{
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"evidence": "/affected/15/package/name"
},
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"affected_versions": [
{
"value": "1:30.2+1-2ubuntu1",
"evidence": "/affected/15/versions"
},
{
"value": "1:30.2+1-6ubuntu1",
"evidence": "/affected/15/versions"
},
{
"value": "1:30.2+1-11ubuntu1",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
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"evidence": "/affected/16/package/name"
},
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{
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"evidence": "/affected/16/versions"
}
]
},
{
"name": {
"value": "xemacs21-packages",
"evidence": "/affected/17/package/name"
},
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{
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]
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{
"name": {
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{
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{
"value": "2009.02.17.dfsg.3-3",
"evidence": "/affected/19/versions"
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{
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]
},
{
"name": {
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{
"value": "1:30.1+1-9ubuntu1",
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{
"value": "1:30.2+1-1ubuntu2",
"evidence": "/affected/20/versions"
},
{
"value": "1:30.2+1-2ubuntu1",
"evidence": "/affected/20/versions"
},
{
"value": "1:30.2+1-2ubuntu1+esm1",
"evidence": "/affected/20/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-71391",
"aliases": [
"UBUNTU-CVE-2026-71391"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N"
},
{
"type": "Ubuntu",
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}
],
"affected": [
{
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"events": [
{
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],
"package": {
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},
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"24.5+1-1ubuntu6",
"24.5+1-1ubuntu7",
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"24.5+1-6ubuntu1.1+esm2",
"24.5+1-6ubuntu1.1+esm3",
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71391.json"
},
"ecosystem_specific": {
"binaries": [
{
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{
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{
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{
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},
{
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},
{
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}
]
}
},
{
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}
],
"package": {
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"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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"21.4.22-14ubuntu1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
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{
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},
{
"binary_name": "xemacs21-mule-canna-wnn",
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},
{
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},
{
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{
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}
]
}
},
{
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]
}
],
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"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71391.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xemacs21-basesupport",
"binary_version": "2009.02.17.dfsg.2-2"
},
{
"binary_name": "xemacs21-basesupport-el",
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},
{
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},
{
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}
]
}
},
{
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],
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
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"25.2+1-6ubuntu0.1~esm2"
],
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},
"ecosystem_specific": {
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{
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},
{
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"binary_version": "25.2+1-6ubuntu0.1~esm2"
},
{
"binary_name": "emacs25-common",
"binary_version": "25.2+1-6ubuntu0.1~esm2"
},
{
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},
{
"binary_name": "emacs25-lucid",
"binary_version": "25.2+1-6ubuntu0.1~esm2"
},
{
"binary_name": "emacs25-nox",
"binary_version": "25.2+1-6ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "xemacs21",
"purl": "pkg:deb/ubuntu/xemacs21?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"21.4.24-4ubuntu1",
"21.4.24-5ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71391.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "xemacs21",
"binary_version": "21.4.24-5ubuntu1"
},
{
"binary_name": "xemacs21-bin",
"binary_version": "21.4.24-5ubuntu1"
},
{
"binary_name": "xemacs21-mule",
"binary_version": "21.4.24-5ubuntu1"
},
{
"binary_name": "xemacs21-mule-canna-wnn",
"binary_version": "21.4.24-5ubuntu1"
},
{
"binary_name": "xemacs21-nomule",
"binary_version": "21.4.24-5ubuntu1"
},
{
"binary_name": "xemacs21-support",
"binary_version": "21.4.24-5ubuntu1"
},
{
"binary_name": "xemacs21-supportel",
"binary_version": "21.4.24-5ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
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}
}
],
"modified": "2026-10-17T13:00:44.992495177Z",
"provider": "osv",
"upstream": [
"CVE-2026-71391"
],
"references": [
"https://ubuntu.com/security/CVE-2026-71391",
"https://www.cve.org/CVERecord?id=CVE-2026-71391",
"https://cert.pl/en/posts/2026/08/CVE-2026-71391",
"https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe",
"https://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html"
]
},
"related_cves": [
{
"value": "CVE-2026-71391",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360815,
"published_at": "2026-08-10T11:17:00+00:00"
}