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  4. CVE 2026 53524 weechat has a decompression bomb in relay
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Back to active CVEs
Medium · CVSS 6.5CVE-2026-53524

WeeChat has a Decompression Bomb in Relay WebSocket (DoS)CVE-2026-53524

Answer in brief

CVE-2026-53524 records a Medium severity (CVSS 6.5) vulnerability in WeeChat has a Decompression Bomb in Relay WebSocket (DoS). The current sources do not mark it as known exploited. The current feed maps weechat/weechat (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 Aug 21, 2026Updated Sep 9, 2026Source checked Oct 6, 2026First seen by HOL Aug 21, 2026Material review Sep 9, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. 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 weechat/weechat (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
weechat/weechatgeneric>=4.3.0 <4.9.14.9.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for weechat/weechat.
  2. 2Review the reported fix. Update weechat/weechat to 4.9.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 21, 2026

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

  2. Source modified

    Sep 9, 2026

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

  3. First seen by HOL

    Aug 21, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source description

WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Sssd: sssd: denial of service via memory exhaustion in autofs responderSame generic ecosystem
  • Sssd: sssd: denial of service via unprivileged autofs cache invalidationSame generic ecosystem
  • Sssd: sssd: access control bypass via improper ldap shadow expiration checkSame generic ecosystem
  • Sssd: sssd: denial of service via use-after-free in kcm ticket renewalSame generic ecosystem
  • Sssd: sssd: denial of service via memory exhaustion in kcm responderSame generic ecosystem
  • Sssd: sssd: denial of service via out-of-bounds write in nfs idmap pluginSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-409
Source
CVE List V5
Source checked
Oct 6, 2026
References
1 linked source
Open source record