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CVE-2026-55612low3.7

uhttpd vulnerable to HTTP request smuggling via invalid chunk-length state reset

Impact

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…

Source excerpt · GitHub_M

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

openwrt · GitHub_M

uhttpd

2 ranges
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

>= b7c85a2819b3869279a669d5681f574824589c6c, < b78f518478794e16ba3568fc1258e40bf3e8eb3b

>= b7c85a2819b3869279a669d5681f574824589c6c, < 34460b8211d676ef1b9f40d6b775c5e112933690

unaffected

unknown

Other versions: unknown

Original 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-55612

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-444 ↗

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

GitHub_M

Related →
Contributing organizations · 1
GitHub_M

Assigning organization

2026-10-30

What changed

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Large field values are marked as truncated previews. Original source snapshots remain retained.

References

3 sources
github.com/openwrt/uhttpd/security/advisories/GHSA-p55c-rmhc-qfm5
Security advisoryGitHub_M
github.com/openwrt/uhttpd/commit/34460b8211d676ef1b9f40d6b775c5e112933690
PatchGitHub_M
github.com/openwrt/uhttpd/commit/b78f518478794e16ba3568fc1258e40bf3e8eb3b
PatchGitHub_M