CVE-2026-57165 pjsip CVE debrief

Who should care

Defenders of applications that use the PJSIP library and enable the telnet CLI front-end should assess exposure and apply the patch. They should prioritize verifying if their applications enable the telnet CLI front-end and apply the patch from commit 628b716 to prevent potential application termination.

Why it matters

Defenders should prioritize verifying if their applications enable the telnet CLI front-end and apply the patch from commit 628b716 to prevent potential application termination.

• Potential application termination
• Need to verify if applications enable the telnet CLI front-end
• Need to apply the patch from commit 628b716

Technical summary

A stack buffer overflow exists in the PJLIB-UTIL telnet CLI front-end of the PJSIP library, which can lead to application termination. This affects applications that enable the telnet CLI front-end. The vulnerability is triggered when the line-redraw sequence for a recalled history entry accumulates more data than a fixed-size stack buffer holds. The issue has been patched via commit 628b716. Defenders should prioritize verifying if their applications enable the telnet CLI front-end and apply the patch from commit 628b716.

Defensive priority

Defenders should prioritize verifying if their applications enable the telnet CLI front-end and apply the patch from commit 628b716.

Recommended defensive actions

• Verify if applications enable the telnet CLI front-end
• Apply the patch from commit 628b716
• Monitor for potential application termination
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the stack buffer overflow vulnerability in the PJLIB-UTIL telnet CLI front-end of the PJSIP library. The vulnerability is caused by a line-redraw sequence that can accumulate more data than a fixed-size stack buffer holds. The issue has been patched via commit 628b716. Defenders should verify if their applications enable the telnet CLI front-end and apply the patch.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.