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Back to active CVEs
Low · CVSS 3.7CVE-2026-55612

uhttpd vulnerable to HTTP request smuggling via invalid chunk-length state resetCVE-2026-55612

Answer in brief

CVE-2026-55612 records a Low severity (CVSS 3.7) vulnerability in uhttpd vulnerable to HTTP request smuggling via invalid chunk-length state reset. The current sources do not mark it as known exploited. The current feed maps openwrt/uhttpd (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 30, 2026Updated Oct 30, 2026Source checked Oct 30, 2026First seen by HOL Oct 30, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 3.7. 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 openwrt/uhttpd (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
openwrt/uhttpdgeneric>=b7c85a2819b3869279a669d5681f574824589c6c <b78f518478794e16ba3568fc1258e40bf3e8eb3b || >=b7c85a2819b3869279a669d5681f574824589c6c <34460b8211d676ef1b9f40d6b775c5e112933690b78f518478794e16ba3568fc1258e40bf3e8eb3b, 34460b8211d676ef1b9f40d6b775c5e112933690

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for openwrt/uhttpd.
  2. 2Review the reported fix. Update openwrt/uhttpd to b78f518478794e16ba3568fc1258e40bf3e8eb3b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 30, 2026

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

  2. Source modified

    Oct 30, 2026

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

  3. First seen by HOL

    Oct 30, 2026

Sources and claim methodology

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

uhttpd is a small HTTP server. In unpatched repository snapshots, `client_poll_post_data()` in `client.c` consumes an invalid chunk-length line, such as a size exceeding INT_MAX, then clears `r->content_length` and `r->transfer_chunked` without draining the remaining body or setting `request.connection_close`. The completion check treats the chunked POST as finished and the keep-alive parser returns to `CLIENT_STATE_INIT`. Attacker-controlled body bytes aligned as a complete HTTP request are then parsed and processed as another request on the same connection, causing HTTP request smuggling and request-boundary desynchronization. Commits b78f518478794e16ba3568fc1258e40bf3e8eb3b and 34460b8211d676ef1b9f40d6b775c5e112933690 patch the issue.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • uhttpd: HTTP request smuggling via ubus POST body parse-error desyncSame openwrt/uhttpd package
  • uhttpd vulnerable to HTTP request smuggling via case-sensitive Transfer-Encoding matchingSame openwrt/uhttpd package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Oct 30, 2026
References
3 linked sources
Open source record