Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling (CVE-2026-31842) | HOL Guard CVE

High · CVSS 7.5CVE-2026-31842

Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling

Answer in brief

CVE-2026-31842 records a High severity (CVSS 7.5) vulnerability in Tinyproxy HTTP request parsing desynchronization via case-sensitive Transfer-Encoding handling. The current sources do not mark it as known exploited. The current feed maps Tinyproxy Project/Tinyproxy (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 Apr 7, 2026Updated Aug 10, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Aug 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.5. 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 Tinyproxy Project/Tinyproxy (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:tinyproxy_project:tinyproxy::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Tinyproxy Project/Tinyproxygeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Tinyproxy Project/Tinyproxy.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Apr 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive comparison of the Transfer-Encoding header in src/reqs.c. The is_chunked_transfer function uses strcmp to compare the header value against "chunked", even though RFC 7230 specifies that transfer-coding names are case-insensitive.

Quoted source text, attributed separately from HOL analysis.