How severe is CVE-2026-28799?

CVE-2026-28799 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-28799 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28799?

CVE-2026-28799 affects Pjsip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28799?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-28799 have an EU (EUVD) identifier?

Yes. CVE-2026-28799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10006.

When was CVE-2026-28799 published?

CVE-2026-28799 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-28799

CVE-2026-28799 is a high-severity vulnerability in Pjsip with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10006
Weakness: CWE-416
Affected product: Pjsip
Published: 2026-03-06
Last modified: 2026-06-17

Description

PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap use-after-free vulnerability exists in PJSIP's event subscription framework (evsub.c) that is triggered during presence unsubscription (SUBSCRIBE with Expires=0). This issue has been patched in version 2.17.

Frequently asked questions

What is CVE-2026-28799?: PJSIP is a free and open source multimedia communication library written in C. Prior to version 2.17, a heap use-after-free vulnerability exists in PJSIP's event subscription framework (evsub.c) that is triggered during presence unsubscription (SUBSCRIBE with Expires=0). This issue has been patched in version 2.17.
How severe is CVE-2026-28799?: CVE-2026-28799 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-28799 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28799?: CVE-2026-28799 affects Pjsip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28799?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-28799 have an EU (EUVD) identifier?: Yes. CVE-2026-28799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10006.
When was CVE-2026-28799 published?: CVE-2026-28799 was published on 2026-03-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pjsip:pjsip:*:*:*:*:*:*:*:*

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