CVE-2026-31842: Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive compa

Q: How do I fix CVE-2026-31842?

tinyproxy: upgrade to newer than 1.11.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-31842 being exploited?

CVE-2026-31842 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-31842 affect?

CVE-2026-31842 affects tinyproxy. Severity is high (CVSS 7.5). 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 agai

Q: How urgent is CVE-2026-31842?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2026-31842 is a high-severity flaw (CVSS 7.5) affecting tinyproxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-444
Published	2026-04-07
Last modified	2026-08-10

Publisher (CNA): TuranSec · Vendor: tinyproxy project

Last updated 2026-08-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 12:16 UTCPublished CVE record published
2026-08-10 12:17 UTCUpdated Record last modified

tinyproxy project tinyproxy UPGRADE

Affected: <= 1.11.3

Fixed in: newer than 1.11.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tinyproxy || rpm -q tinyproxy || tinyproxy --version

2. UPGRADE to newer than 1.11.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tinyproxy

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tinyproxy

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-31842?

tinyproxy: upgrade to newer than 1.11.3. Exact commands for each OS are on this page.

Is CVE-2026-31842 being exploited?

CVE-2026-31842 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-31842 affect?

CVE-2026-31842 affects tinyproxy. Severity is high (CVSS 7.5). 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 agai

How urgent is CVE-2026-31842?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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