Vulnerability-Lookup

RHSA-2026:6628

Vulnerability from csaf_redhat - Published: 2026-04-06 05:23 - Updated: 2026-04-06 10:31

Summary

Red Hat Security Advisory: fontforge security update

Severity

Important

Notes

Topic: An update for fontforge is now available for Red Hat Enterprise Linux 9. 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.

CVE-2025-15270

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)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-129 - Improper Validation of Array Index

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-2026:6628

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

URL

Category

	https://access.redhat.com/errata/RHSA-2026:6628	self
	https://access.redhat.com/security/updates/classi…	external
	https://bugzilla.redhat.com/show_bug.cgi?id=2426434	external
	https://security.access.redhat.com/data/csaf/v2/a…	self
	https://access.redhat.com/security/cve/CVE-2025-15270	self
	https://bugzilla.redhat.com/show_bug.cgi?id=2426434	external
	https://www.cve.org/CVERecord?id=CVE-2025-15270	external
	https://nvd.nist.gov/vuln/detail/CVE-2025-15270	external
	https://www.zerodayinitiative.com/advisories/ZDI-…	external

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        "relates_to_product_reference": "CRB-9.7.0.Z.MAIN"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "fontforge-debugsource-0:20201107-8.el9_7.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)",
          "product_id": "CRB-9.7.0.Z.MAIN:fontforge-debugsource-0:20201107-8.el9_7.x86_64"
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        "product_reference": "fontforge-debugsource-0:20201107-8.el9_7.x86_64",
        "relates_to_product_reference": "CRB-9.7.0.Z.MAIN"
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  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-15270",
      "cwe": {
        "id": "CWE-129",
        "name": "Improper Validation of Array Index"
      },
      "discovery_date": "2025-12-31T08:01:41.978441+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2426434"
        }
      ],
      "notes": [
        {
          "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"
        }
      ],
      "product_status": {
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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": "2026-04-06T05:23:14+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-2026:6628"
        },
        {
          "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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          "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"
    }
  ]
}

CVE-2025-15270 (GCVE-0-2025-15270)

Vulnerability from cvelistv5 – Published: 2025-12-31 06:58 – Updated: 2025-12-31 16:58

Title

FontForge SFD File Parsing Improper Validation of Array Index Remote Code Execution Vulnerability

Summary

FontForge SFD File Parsing Improper Validation of Array Index Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of FontForge. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of SFD files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated array. An attacker can leverage this vulnerability to execute code in the context of the current user. Was ZDI-CAN-28563.

Severity ?

8.8 (High)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-129 - Improper Validation of Array Index

Assigner

zdi

References

URL

	Vendor	Product	Version
	FontForge	FontForge	Affected: aca4f524c6cb14cdc7bc4cd493492a33f5154797

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.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2026:6628

CVE-2025-15270 (GCVE-0-2025-15270)

Tags

Sightings

Nomenclature