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CVE-2026-26203

PJSIP is a free and open source multimedia communication library. Versions prior to 2.17 have a critical heap buffer underflow vulnerability in PJSIP's H.264 packetizer. The bug occurs when processing malformed H.264 bitstreams without NAL unit start codes, where the packetizer performs unchecked pointer arithmetic that can read from memory located before the allocated buffer. Version 2.17 contains a patch for the issue.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:26047918108e156158951507f88be0ffd1e6cb2447891774fb4958619f77ef62
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"pjmedia-video","vendor":"pjsip","versions":[{"status":"affected","version":"< 2.17"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a410f5a711f3643dccba67225b8608f25868c1944631947919f8ed4695c795c0 · sha256:5637768c66ac6b8b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":5.1,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:L","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a410f5a711f3643dccba67225b8608f25868c1944631947919f8ed4695c795c0 · sha256:5637768c66ac6b8b… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a410f5a711f3643dccba67225b8608f25868c1944631947919f8ed4695c795c0 · sha256:5637768c66ac6b8b… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/pjsip/pjproject/commit/5aee54f09d4f91538d55279d7316591b28fded6c","tags":["x_refsource_MISC"],"url":"https://github.com/pjsip/pjproject/commit/5aee54f09d4f91538d55279d7316591b28fded6c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a410f5a711f3643dccba67225b8608f25868c1944631947919f8ed4695c795c0 · sha256:5637768c66ac6b8b… · /containers/cna/references/1
{"name":"https://github.com/pjsip/pjproject/security/advisories/GHSA-p965-mf7j-gwv8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pjsip/pjproject/security/advisories/GHSA-p965-mf7j-gwv8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a410f5a711f3643dccba67225b8608f25868c1944631947919f8ed4695c795c0 · sha256:5637768c66ac6b8b… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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