CVE-2026-40892: PJSIP is a free and open source multimedia communication library written in C

Q: How do I fix CVE-2026-40892?

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

Q: Is CVE-2026-40892 being exploited?

CVE-2026-40892 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-2026-40892 affect?

CVE-2026-40892 affects pjsip. Severity is critical (CVSS 9.8). PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_create_digest2() in PJSIP when using pre-computed digest credentials (PJSIP_CRED_DATA_DIGEST).

Q: How urgent is CVE-2026-40892?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-40892 is a critical-severity flaw (CVSS 9.8) 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. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_create_digest2() in PJSIP when using pre-computed digest credentials (PJSIP_CRED_DATA_DIGEST). The function copies credential data using cred_info->data.slen as the length without an upper-bound check, which can overflow the fixed-size ha1 stack buffer (128 bytes) if data.slen exceeds the expected digest

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-04-21
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 21:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

pjsip pjsip UPGRADE

Affected: < 2.17

Fixed in: 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 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-2026-40892?

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

Is CVE-2026-40892 being exploited?

CVE-2026-40892 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-2026-40892 affect?

CVE-2026-40892 affects pjsip. Severity is critical (CVSS 9.8). PJSIP is a free and open source multimedia communication library written in C. In 2.16 and earlier, a stack buffer overflow exists in pjsip_auth_create_digest2() in PJSIP when using pre-computed digest credentials (PJSIP_CRED_DATA_DIGEST).

How urgent is CVE-2026-40892?

Priority 48/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

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
CVE-2026-84975 HIGH 7.4 UPGRADE PJSIP is a free and open source multimedia communication library written in C

References

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