CVE-2026-113399: Incorrect boundary conditions in the SVG component

Awaiting analysis

AliasesUBUNTU-CVE-2026-113399

Published 20-10-2026Last modified 29-10-2026

Vulnerability summary

CVE-2026-113399 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in mozjs102 Ubuntu. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 42.1% of scored vulnerabilities.

Priority

Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?

CVSS score

9.8/10

010

Critical · v3.1 (CVE.org)

EPSS score

0.49%

0%100%

Low · Change unavailable

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1

OPENSUSE-SU-2026:12259-1

Timeline

20-10-2026
PublishedVulnerability first disclosed.
29-10-2026
Last modifiedVulnerability information updated.

Description

Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.

CVSS metrics

3 scores · 3 sources · 1 version

v3.19.8

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

Change unavailable

21-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

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

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu8 products

mozjs102All versions (No fix recorded)
mozjs115All versions (No fix recorded)
mozjs38All versions (No fix recorded)
mozjs52All versions (No fix recorded)
mozjs68All versions (No fix recorded)

Show all 8

1 vendor · 8 products

References

6 links