How severe is CVE-2026-40892?

CVE-2026-40892 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40892 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40892?

CVE-2026-40892 affects Pjsip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40892?

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

Does CVE-2026-40892 have an EU (EUVD) identifier?

Yes. CVE-2026-40892 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24469.

When was CVE-2026-40892 published?

CVE-2026-40892 was published on 2026-04-21 and last updated on 2026-06-17.

CVE-2026-40892

CVE-2026-40892 is a critical-severity vulnerability in Pjsip with a CVSS 3.x base score of 9.8. 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-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.1
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24469
Weakness: CWE-121
Affected product: Pjsip
Published: 2026-04-21
Last modified: 2026-06-17

Description

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 string length.

Frequently asked questions

What is CVE-2026-40892?: 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 string length.
How severe is CVE-2026-40892?: CVE-2026-40892 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40892 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40892?: CVE-2026-40892 affects Pjsip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40892?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-40892 have an EU (EUVD) identifier?: Yes. CVE-2026-40892 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24469.
When was CVE-2026-40892 published?: CVE-2026-40892 was published on 2026-04-21 and last updated on 2026-06-17.

References

Affected products (1)

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

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