CVE-2025-1012 — Use After Free in Mozilla Firefox

CWE-416 — Use After FreeCWE-401 — Missing Release of Memory after Effective LifetimeCWE-125 — Out-of-bounds Read17 documents10 sources
Severity
7.5HIGHNVD
OSV9.8
EPSS
0.4%
top 37.56%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla ThunderbirdMozilla Firefox
Timeline
PublishedFeb 4
Latest updateDec 3

Description

A race during concurrent delazification could have led to a use-after-free. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 1.6 | Impact: 5.9

Affected Packages4 packages

▶NVDmozilla/firefox128.1.0 — 128.7.0+2
▶Ubuntumozilla/firefox< 135.0+build2-0ubuntu0.20.04.1
▶NVDmozilla/thunderbird128.0.1 — 128.7.0+1
▶Debianmozilla/thunderbird< 1:128.7.0esr-1~deb11u1+3

🔴Vulnerability Details

4
OSV
firefox vulnerabilities↗2025-02-11
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OSV
CVE-2025-1012: A race during concurrent delazification could have led to a use-after-free↗2025-02-04
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GHSA
GHSA-hjjx-mmjm-vp9r: A race during concurrent delazification could have led to a use-after-free↗2025-02-04
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CVEList
Use-after-free during concurrent delazification↗2025-02-04
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📋Vendor Advisories

11
Red Hat
libpng: LIBPNG out-of-bounds read in png_image_read_composite↗2025-12-03
▶
Ubuntu
Thunderbird vulnerabilities↗2025-07-22
▶
Ubuntu
Firefox vulnerabilities↗2025-02-11
▶
Red Hat
firefox: thunderbird: Use-after-free during concurrent delazification↗2025-02-04
▶
Debian
CVE-2025-1012: firefox - A race during concurrent delazification could have led to a use-after-free. This...↗2025
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CVE-2025-1012 — Use After Free in Mozilla Firefox | cvebase