CVE-2026-109753

CVSS: 8.1v3.1HighDeferred

AliasesDEBIAN-CVE-2026-109753

Published 2026-10-13Last modified 2026-10-15

Open JSON

Vulnerability summary

Overall risk

32/100

0100

Medium · default modelHow is this calculated?

CVSS score

8.1/10

010

High · v3.1 (CVE.org)

EPSS score

0.16%

0%100%

Low · Change unavailable

KEVNot listed0 of 3 catalogs

RansomwareNone recordedNo known use recorded

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1

OPENSUSE-SU-2026:12116-1

Timeline

2026-10-13
PublishedVulnerability first disclosed.
2026-10-15
Last modifiedVulnerability information updated.

Description

Incorrect boundary conditions in the Layout component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS metrics

2 scores · 2 sources · 1 version

v3.18.1

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

Versus all other CVEs

30-day change

Change unavailable

2026-10-142026-10-15

EPSS score

0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Affected systems

Debian2 products

firefox-esrAll versions (No fix recorded) | < 153.5.0esr-1~deb12u1 | < 153.5.0esr-1~deb13u1
thunderbirdAll versions (No fix recorded)

1 vendor · 2 products

References

7 links