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Public proof of concept

CVE-2026-31842

A public proof of concept exists; no exploitation attested.

  • Published2026-04-07
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-0712:16CVE publishedNVD

Versions per branch

NVD
Tinyproxy project tinyproxy
BranchAffectedFixed in
1.11≤ 1.11.3no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As TuranSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-10

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • tinyproxyUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • tinyproxyUbuntu:Pro:18.04:LTSall versions · no fixed version listed
  • tinyproxyUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • tinyproxyUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • tinyproxyUbuntu:26.10all versions · no fixed version listed
  • tinyproxyUbuntu:26.04:LTSall versions · no fixed version listed
  • tinyproxyUbuntu:25.10all versions · no fixed version listed
  • tinyproxyUbuntu:24.04:LTSall versions · no fixed version listed

4 more package ranges on OSV.dev

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-04-07
  • CNACVSS 4.08.7known since 2026-10-23
  • CNACVSS 3.17.5known since 2026-10-23
  • CNACVSS 2.07.8known since 2026-10-23
  • CNAweakness (CWE)CWE-444known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-04-07
Last Modified
2026-08-10
NVD status
Modified
GitHub Advisory
GHSA-mh87-c4c3-cgwf

Frequently asked questions

What is CVE-2026-31842?

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.

Is CVE-2026-31842 actively exploited?

A proof-of-concept exploit exists for CVE-2026-31842, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-31842?

CVE-2026-31842 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record