CVE-2026-113399: Incorrect boundary conditions in the SVG component
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
Description quoted from the CVE record (assigned by mozilla, published 2026-10-20).
Weakness: CWE-190 Integer Overflow or Wraparound
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer evidence for this CVE has not been fetched yet.
Live scores
- EPSS
- 0.005
low predicted chance of attack - VEDAS
- 0.960
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- None yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Mozilla Firefox | Not stated | 158.0.1 is not affected |
| Mozilla Thunderbird | Not stated | 158.0.1 is not affected |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- Firefox 159 fixes 167 CVEs, 108 rated high, including sandbox escapes (MFSA 2026-118) (full advisory)
- Mozilla Firefox 159: 167 CVEs, 108 rated high, many found by AI tools (CVE-2026-117860 to CVE-2026-118017, CVE-2026-113399, CVE-2026-113470) (27 Oct 2026)
References
Other references
- https://bugzilla.mozilla.org/show_bug.cgi?id=2079938
- https://www.mozilla.org/security/advisories/mfsa2026-111/
- https://www.mozilla.org/security/advisories/mfsa2026-114/
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS). Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.