CVE-2026-0886
published 2026-01-13CVE-2026-0886: Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147…
PriorityP427medium5.3CVSS 3.1
AVNACLPRNUINSUCLINAN
EPSS
0.44%
35.4th percentile
Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 147.0-1 (sid) | firefox 147.0-1 (sid) |
| debian | firefox-esr | < firefox 147.0-1 (sid) | firefox 147.0-1 (sid) |
| debian | thunderbird | < firefox 147.0-1 (sid) | firefox 147.0-1 (sid) |
| mozilla | firefox | < 115.32.0 | 115.32.0 |
| mozilla | firefox | < 147.0 | 147.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 128.0 < 140.7.0 | 140.7.0 |
| mozilla | thunderbird | < 140.7.0 | 140.7.0 |
| mozilla | thunderbird | < 147.0 | 147.0 |
| mozilla | thunderbird | >= 0 < 1:140.7.0esr-1~deb11u1 | 1:140.7.0esr-1~deb11u1 |
| mozilla | thunderbird | >= 0 < 1:140.7.0esr-1~deb12u1 | 1:140.7.0esr-1~deb12u1 |
| mozilla | thunderbird | >= 0 < 1:140.7.0esr-1~deb13u1 | 1:140.7.0esr-1~deb13u1 |
| mozilla | thunderbird | >= 0 < 1:140.7.0esr-1 | 1:140.7.0esr-1 |
CVSS provenance
nvdv3.15.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
osv5.3MEDIUM
vendor_debian5.3MEDIUM
vendor_redhat5.3MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
OSV
CVE-2026-0886: Incorrect boundary conditions in the Graphics component
osv·2026-01-13·CVSS 5.3
CVE-2026-0886 [MEDIUM] CVE-2026-0886: Incorrect boundary conditions in the Graphics component
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
GHSA
GHSA-7328-g372-24vf: Incorrect boundary conditions in the Graphics component
ghsa_unreviewed·2026-01-13
CVE-2026-0886 [MEDIUM] CWE-119 GHSA-7328-g372-24vf: Incorrect boundary conditions in the Graphics component
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7.
Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2025-8031 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
firefox: thunderbird: Incorrect boundary conditions in the Graphics component
vendor_redhat·2026-01-13·CVSS 5.3
CVE-2026-0886 [MEDIUM] firefox: thunderbird: Incorrect boundary conditions in the Graphics component
firefox: thunderbird: Incorrect boundary conditions in the Graphics component
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the Graphics component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package:
Debian
CVE-2026-0886: firefox - Incorrect boundary conditions in the Graphics component. This vulnerability affe...
vendor_debian·2026·CVSS 5.3
CVE-2026-0886 [MEDIUM] CVE-2026-0886: firefox - Incorrect boundary conditions in the Graphics component. This vulnerability affe...
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
Scope: local
sid: resolved (fixed in 147.0-1)
Mozilla
Mozilla Foundation Security Advisory 2026-03: CVE-2026-0886
vendor_mozilla·CVSS 5.3
CVE-2026-0886 [MEDIUM] Mozilla Foundation Security Advisory 2026-03: CVE-2026-0886
Mozilla Foundation Security Advisory 2026-03
CVE: CVE-2026-0886
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.7
Mozilla
Mozilla Foundation Security Advisory 2026-01: CVE-2026-0886
vendor_mozilla·CVSS 5.3
CVE-2026-0886 [MEDIUM] Mozilla Foundation Security Advisory 2026-01: CVE-2026-0886
Mozilla Foundation Security Advisory 2026-01
CVE: CVE-2026-0886
Product: Firefox
Impact: moderate
Fixed in: Firefox 147
Mozilla
Mozilla Foundation Security Advisory 2026-04: CVE-2026-0886
vendor_mozilla·CVSS 5.3
CVE-2026-0886 [MEDIUM] Mozilla Foundation Security Advisory 2026-04: CVE-2026-0886
Mozilla Foundation Security Advisory 2026-04
CVE: CVE-2026-0886
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 147
Mozilla
Mozilla Foundation Security Advisory 2026-02: CVE-2026-0886
vendor_mozilla·CVSS 5.3
CVE-2026-0886 [MEDIUM] Mozilla Foundation Security Advisory 2026-02: CVE-2026-0886
Mozilla Foundation Security Advisory 2026-02
CVE: CVE-2026-0886
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 115.32
Mozilla
Mozilla Foundation Security Advisory 2026-05: CVE-2026-0886
vendor_mozilla·CVSS 5.3
CVE-2026-0886 [MEDIUM] Mozilla Foundation Security Advisory 2026-05: CVE-2026-0886
Mozilla Foundation Security Advisory 2026-05
CVE: CVE-2026-0886
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.7
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-0886 firefox: thunderbird: Incorrect boundary conditions in the Graphics component
bugzilla·2026-01-13·CVSS 5.3
CVE-2026-0886 [MEDIUM] CVE-2026-0886 firefox: thunderbird: Incorrect boundary conditions in the Graphics component
CVE-2026-0886 firefox: thunderbird: Incorrect boundary conditions in the Graphics component
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, and Firefox ESR < 140.7.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2026:0667 https://access.redhat.com/errata/RHSA-2026:0667
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2026:0694 https://access.redhat.com/errata/RHSA-2026:0694
---
This issue has been addressed in the following products:
Red Hat Enterprise Linux 9
Via RHSA-2026:0924 https://access.redhat.com/errata/RHSA-2026:0924
---
This issue has been addressed in the following products:
Red Hat Ente
Wiz
CVE-2026-0886 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.3
CVE-2026-0886 [MEDIUM] CVE-2026-0886 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-0886 :
NixOS vulnerability analysis and mitigation
Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
Source : NVD
## 5.3
Score
Published January 13, 2026
Severity MEDIUM
CNA Score 5.3
Affected Technologies
NixOS
Mozilla Firefox
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 4.6
Exploitation Probability (EPSS) N/A
Affected packages and libraries
cpe:2.3:a:mozilla:firefox_esr
MozillaThunderbird-translations-common
Sources
AlmaLinux 8 Severity HIGH Has Fix Added at: Feb 11, 2026
AlmaLinux 9 Severity HIGH Has Fix Added at: Jan 20, 2026
https://bugzilla.mozilla.org/show_bug.cgi?id=2005658https://www.mozilla.org/security/advisories/mfsa2026-01/https://www.mozilla.org/security/advisories/mfsa2026-02/https://www.mozilla.org/security/advisories/mfsa2026-03/https://www.mozilla.org/security/advisories/mfsa2026-04/https://www.mozilla.org/security/advisories/mfsa2026-05/
2026-01-13
Published