Description
An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| tinyproxy | tinyproxy | <=1.11.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tinyproxy | No fix yet | — |
| Debian 13 | tinyproxy | No fix yet | — |
| Debian 12 | tinyproxy | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tinyproxy | No fix yet | — |
| Ubuntu 26.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu 25.10 | tinyproxy | No fix yet | — |
| Ubuntu 24.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu 20.04 LTS | tinyproxy | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu Pro 18.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tinyproxy | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tinyproxy | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tinyproxy | 1.11.3-2.1 | openSUSE-SU-2026:10471-1 |
| openSUSE Leap 16.0 | tinyproxy | 1.11.3-bp160.1.1 | openSUSE-SU-2026:20456-1 |
Advisories 3
- WID-SEC-2026-0909 Tinyproxy: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Apr 12, 2026
- openSUSE-SU-2026:20456-1 Security update for tinyproxy SUSE / openSUSE Security Updates · Apr 3, 2026
- openSUSE-SU-2026:10471-1 tinyproxy-1.11.3-2.1 on GA media SUSE / openSUSE Security Updates · Apr 1, 2026
References
- https://github.com/tinyproxy/tinyproxy/issues/602 issue-tracking technical-description
- https://github.com/tinyproxy/tinyproxy/pull/603 patch
- https://github.com/tinyproxy/tinyproxy/commit/969852c patch
- https://github.com/tinyproxy/tinyproxy/commit/bb7edc4 patch
- https://github.com/tinyproxy/tinyproxy/releases release-notes