RHSA-2026:6635
Vulnerability from csaf_redhat - Published: 2026-04-06 07:50 - Updated: 2026-04-06 10:35Summary
Red Hat Security Advisory: fontforge security update
Severity
Important
Notes
Topic: An update for fontforge is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: FontForge is a font editor for outline and bitmap fonts. It supports a range of font formats, including PostScript (ASCII and binary Type 1, some Type 3 and Type 0), TrueType, OpenType (Type2) and CID-keyed fonts.
Security Fix(es):
* fontforge: FontForge: Remote Code Execution via malicious SFD file parsing (CVE-2025-15270)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 FontForge. This vulnerability allows a remote attacker to execute arbitrary code by tricking a user into opening a specially crafted SFD (Spline Font Database) file. The issue stems from improper validation of array indexes during SFD file parsing, which can lead to writing data beyond the allocated memory boundary. Successful exploitation results in arbitrary code execution in the context of the current user.
8.8 (High)
Vendor Fix
For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2026:6635
Workaround
To mitigate this issue, users should avoid opening untrusted SFD (Spline Font Database) files with FontForge. If FontForge is not required, consider removing the `fontforge` package to eliminate the attack surface.
To remove the package on Red Hat Enterprise Linux:
`sudo yum remove fontforge` (for RHEL 6/7)
`sudo dnf remove fontforge` (for RHEL 8/9/10 and Fedora)
Removing this package may impact functionality that relies on FontForge.
References
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{
"cve": "CVE-2025-15270",
"cwe": {
"id": "CWE-129",
"name": "Improper Validation of Array Index"
},
"discovery_date": "2025-12-31T08:01:41.978441+00:00",
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"category": "description",
"text": "A flaw was found in FontForge. This vulnerability allows a remote attacker to execute arbitrary code by tricking a user into opening a specially crafted SFD (Spline Font Database) file. The issue stems from improper validation of array indexes during SFD file parsing, which can lead to writing data beyond the allocated memory boundary. Successful exploitation results in arbitrary code execution in the context of the current user.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "fontforge: FontForge: Remote Code Execution via malicious SFD file parsing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products as it allows remote code execution in FontForge. Exploitation requires user interaction, where a target must open a specially crafted SFD file. This affects systems where FontForge is installed and used to process untrusted font files.",
"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"
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-15270"
},
{
"category": "external",
"summary": "RHBZ#2426434",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2426434"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-15270",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-15270"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-15270",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15270"
},
{
"category": "external",
"summary": "https://www.zerodayinitiative.com/advisories/ZDI-25-1194/",
"url": "https://www.zerodayinitiative.com/advisories/ZDI-25-1194/"
}
],
"release_date": "2025-12-31T06:58:49.796000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-04-06T07:50:34+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:6635"
},
{
"category": "workaround",
"details": "To mitigate this issue, users should avoid opening untrusted SFD (Spline Font Database) files with FontForge. If FontForge is not required, consider removing the `fontforge` package to eliminate the attack surface.\n\nTo remove the package on Red Hat Enterprise Linux:\n`sudo yum remove fontforge` (for RHEL 6/7)\n`sudo dnf remove fontforge` (for RHEL 8/9/10 and Fedora)\n\nRemoving this package may impact functionality that relies on FontForge.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "fontforge: FontForge: Remote Code Execution via malicious SFD file parsing"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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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