CVE catalog

CVE-2026-54387

Severity: Critical · CVSS 9.3
Published: Jun 17, 2026, 7:48:37 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.44% · Oct 25, 2026

Tinyproxy through 1.11.3, fixed in commit ff45d3b, fails to reconcile conflicting Content-Length and Transfer-Encoding: chunked headers, forwarding both verbatim to the backend while using Content-Length to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	tinyproxy	sid	`1.11.3-1`	vulnerable
Debian	tinyproxy	forky	`1.11.3-1`	vulnerable
Debian	tinyproxy	trixie	`1.11.2-1`	vulnerable
Debian	tinyproxy	bookworm	`1.11.1-2.1+deb12u1`	vulnerable
Debian	tinyproxy	bookworm-security	`1.11.1-2.1+deb12u1`	vulnerable
Cpe	tinyproxy	Not reported	Not reported	vulnerable
Opensuse	tinyproxy	tumbleweed	`1.11.3-3.1`	fixed
Opensuse	tinyproxy	leap 16.0	`1.11.3-bp160.2.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	tinyproxy	source	sid	`(unfixed)`	not yet assigned	Not reported	[1140350]
Debian	tinyproxy	source	forky	`(unfixed)`	not yet assigned	Not reported	[1140350]
Debian	tinyproxy	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1140350]
Debian	tinyproxy	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1140350]
Opensuse	tinyproxy	rpm	tumbleweed	`1.11.3-3.1`	Not reported	OPENSUSE-SU-2026:11060-1	Not reported
Opensuse	tinyproxy	rpm	leap 16.0	`1.11.3-bp160.2.1`	Not reported	OPENSUSE-SU-2026:22133-1	Not reported

[Debian bug #1140350]

Notes

[trixie] tinyproxy: Minor issue [bookworm] tinyproxy: Minor issue; forward proxy does not pool backend connections across clients, exploitation needs a shared upstream proxy/cache, no upstream release with the fix

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[tinyproxy]Affected
Details (6)
- 1.11.1-2.1+deb12u1 · all · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · all · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · all · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · all · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
[tinyproxy-bin]Affected
Source package: [tinyproxy]
Details (6)
- 1.11.1-2.1+deb12u1 · amd64 · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · arm64 · bookworm
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.2-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · amd64 · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12
- 1.11.1-2.1+deb12u1 · arm64 · bookworm-security
  Affected
  nvd · tinyproxy · debian · bookworm; nvd · tinyproxy · debian · 12

[Debian 13 (Trixie)]

[tinyproxy]Affected
Details (4)
- 1.11.2-1 · all · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.2-1 · all · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · all · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · all · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13
[tinyproxy-bin]Affected
Source package: [tinyproxy]
Details (4)
- 1.11.2-1 · amd64 · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.2-1+b1 · arm64 · trixie
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · amd64 · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13
- 1.11.3-1~bpo13+1 · arm64 · trixie-backports
  Affected
  nvd · tinyproxy · debian · 13

[openSUSE Tumbleweed]

[tinyproxy]Fixed
Source package: [tinyproxy]
Details (1)
- 1.11.3-3.3 · x86_64 · tumbleweed
  Fixed · Fixed: 1.11.3-3.1
  nvd · tinyproxy · opensuse · tumbleweed

Observed: Oct 23, 2026, 9:45:35 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]