CVE-2026-57161: PJSIP is a free and open source multimedia communication library written in C

Q: How do I fix CVE-2026-57161?

pjsip: upgrade to newer than 2.17. Exact commands for each OS are on this page.

Q: Is CVE-2026-57161 being exploited?

CVE-2026-57161 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-2026-57161 affect?

CVE-2026-57161 affects pjsip. Severity is high (CVSS 8.2). PJSIP is a free and open source multimedia communication library written in C. Prior to commit acc03b5, a stack buffer overflow exists in PJSUA when processing Service-Route headers in a registration response (update_service_route() in pjsu

Q: How urgent is CVE-2026-57161?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.2REMOTEUPGRADE

CVE-2026-57161 is a high-severity flaw (CVSS 8.2) affecting pjsip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PJSIP is a free and open source multimedia communication library written in C. Prior to commit acc03b5, a stack buffer overflow exists in PJSUA when processing Service-Route headers in a registration response (update_service_route() in pjsua_acc.c). This affects applications that register using the PJSUA/PJSUA2 account API (the default registration path). The Service-Route URIs from a 2xx response to REGISTER are stored into a fixed-size array wi

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-09-04
Last modified	2026-09-11

Publisher (CNA): GitHub, Inc. · Vendor: teluu

Last updated 2026-09-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-04 18:17 UTCPublished CVE record published
2026-09-11 15:34 UTCUpdated Record last modified

teluu pjsip UPGRADE

Affected: <= 2.17

Fixed in: newer than 2.17

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.17 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pjsip

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-2026-57161?

pjsip: upgrade to newer than 2.17. Exact commands for each OS are on this page.

Is CVE-2026-57161 being exploited?

CVE-2026-57161 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-2026-57161 affect?

CVE-2026-57161 affects pjsip. Severity is high (CVSS 8.2). PJSIP is a free and open source multimedia communication library written in C. Prior to commit acc03b5, a stack buffer overflow exists in PJSUA when processing Service-Route headers in a registration response (update_service_route() in pjsu

How urgent is CVE-2026-57161?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40892 CRITICAL 9.8 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-41415 CRITICAL 9.1 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-40614 HIGH 8.8 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-42225 MEDIUM 5.9 UPGRADE PJSIP is a free and open source multimedia communication library written in C
CVE-2026-41416 HIGH 7.5 UPGRADE PJSIP is a free and open source multimedia communication library written in C

References

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