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  4. CVE 2026 118673 keepassxc out of bounds write in browser
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Back to active CVEs
Medium · CVSS 4.1CVE-2026-118673

KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responsesCVE-2026-118673

Answer in brief

CVE-2026-118673 records a Medium severity (CVSS 4.1) vulnerability in KeePassXC: Out-of-bounds write in browser integration response encryption with oversized database responses. The current sources do not mark it as known exploited. The current feed maps keepassxreboot/keepassxc (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 29, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Oct 29, 2026Material review Oct 29, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.1
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps keepassxreboot/keepassxc (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
keepassxreboot/keepassxcgeneric>=2.3.0 <2.8.02.8.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for keepassxreboot/keepassxc.
  2. 2Review the reported fix. Update keepassxreboot/keepassxc to 2.8.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 29, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

KeePassXC is a cross-platform community-driven port of the Windows application KeePass Password Safe. From 2.3.0 until 2.8.0, KeePassXC browser integration encrypts authorized responses in src/browser/BrowserMessageBuilder.cpp using a fixed 1 MiB output vector even though Botan::Sodium::crypto_box_easy() writes the plaintext length plus crypto_box_MACBYTES. A browser-protocol client that can access the per-user IPC endpoint, has a valid database association, and causes an unlocked database to generate and encrypt a sufficiently large authorized response can trigger a sequential out-of-bounds write before any response is delivered. This issue is fixed in version 2.8.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Botan: Integer overflow when reporting block size in FFI can cause memory corruptionAlso CWE-787

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Oct 29, 2026
References
4 linked sources
Open source record