CVE-2026-109723

CVSS: 5.4v3.1MediumDeferred

AliasesDEBIAN-CVE-2026-109723

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

Open JSON

Vulnerability summary

Overall risk

22/100

0100

Low · default modelHow is this calculated?

CVSS score

5.4/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.15%

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

Integer overflow in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS metrics

2 scores · 2 sources · 1 version

v3.15.4

EPSS trend

Probability

0.15%

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

0.15%

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-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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

6 links