CVE-2025-63938: Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within

Q: How do I fix CVE-2025-63938?

tinyproxy: upgrade to newer than 1.11.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-63938 being exploited?

CVE-2025-63938 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-2025-63938 affect?

CVE-2025-63938 affects tinyproxy. Severity is medium (CVSS 6.5). Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within src/reqs.c.

Q: How urgent is CVE-2025-63938?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 6.5REMOTEUPGRADE

CVE-2025-63938 is a medium-severity flaw (CVSS 6.5) affecting tinyproxy. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within src/reqs.c.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-190
Published	2025-11-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: tinyproxy project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-26 17:15 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

tinyproxy project tinyproxy UPGRADE

Affected: <= 1.11.2

Fixed in: newer than 1.11.2

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 1.11.2 (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-2025-63938?

tinyproxy: upgrade to newer than 1.11.2. Exact commands for each OS are on this page.

Is CVE-2025-63938 being exploited?

CVE-2025-63938 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-2025-63938 affect?

CVE-2025-63938 affects tinyproxy. Severity is medium (CVSS 6.5). Tinyproxy through 1.11.2 contains an integer overflow vulnerability in the strip_return_port() function within src/reqs.c.

How urgent is CVE-2025-63938?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-31842 HIGH 7.5 UPGRADE Tinyproxy through 1.11.3 is vulnerable to HTTP request parsing desynchronization due to a case-sensitive compa
CVE-2023-49606 CRITICAL 9.8 DOWNGRADE A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy
CVE-2022-40468 HIGH 7.5 UPGRADE Potential leak of left-over heap data if custom error page templates containing special non-standard variables
CVE-2017-11747 MEDIUM 5.5 UPGRADE main.c in Tinyproxy 1.8.4 and earlier creates a /run/tinyproxy/tinyproxy.pid file after dropping privileges to
CVE-2012-3505 MEDIUM 5.0 UPGRADE Tinyproxy 1.8.3 and earlier allows remote attackers to cause a denial of service (CPU and memory consumption)

References

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