Vulnerability-Lookup

OPENSUSE-SU-2026:20456-1

Vulnerability from csaf_opensuse - Published: 2026-04-01 16:15 - Updated: 2026-04-01 16:15

Summary

Security update for tinyproxy

Severity

Important

Notes

Title of the patch: Security update for tinyproxy

Description of the patch: This update for tinyproxy fixes the following issues: Changes in tinyproxy: - CVE-2026-3945: Fixed denial of service by unauthenticated remote attacker (boo#1261024) - Update to release 1.11.3 * conf: add BasicAuthRealm feature * basic auth: fix error status 401 vs 407 * tinyproxy.conf.5: explain what a site_spec looks like * tinyproxy.conf.5: add an IPv6 example to allow/deny section * reqs: fix integer overflow in port number processing

Patchnames: openSUSE-Leap-16.0-packagehub-185

CVE-2026-3945

Vendor Fix To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

References

URL

Category

	https://www.suse.com/support/security/rating/	external
	https://ftp.suse.com/pub/projects/security/csaf/o…	self
	https://bugzilla.suse.com/1261024	self
	https://www.suse.com/security/cve/CVE-2026-3945/	self
	https://www.suse.com/security/cve/CVE-2026-3945	external
	https://bugzilla.suse.com/1261024	external

JSON

To clipboard

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}

CVE-2026-3945 (GCVE-0-2026-3945)

Vulnerability from cvelistv5 – Published: 2026-03-30 07:05 – Updated: 2026-03-30 15:02

Summary

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). A crafted chunk size such as 0x7fffffffffffffff (LONG_MAX) bypasses the existing validation check (chunklen < 0), leading to a signed integer overflow during arithmetic operations (chunklen + 2). This results in incorrect size calculations, causing the proxy to attempt reading an extremely large amount of request-body data and holding worker connections open indefinitely. An attacker can exploit this behavior to exhaust all available worker slots, preventing new connections from being accepted and causing complete service unavailability. Upstream addressed this issue in commit bb7edc4; however, the latest stable release (1.11.3) remains affected at the time of publication.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.7 (High)


                        
                          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

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

TuranSec

References

URL

Tags

	https://github.com/tinyproxy/tinyproxy/issues/602	issue-trackingtechnical-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

Impacted products

	Vendor	Product	Version
	tinyproxy	tinyproxy	Affected: <=1.11.3

Credits

Muxammadiyev G'iyosiddin

Show details on NVD website

JSON

To clipboard

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                "role": "CISA Coordinator",
                "timestamp": "2026-03-30T15:01:46.663274Z",
                "version": "2.0.3"
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

OPENSUSE-SU-2026:20456-1

CVE-2026-3945 (GCVE-0-2026-3945)

Tags

Sightings

Nomenclature