How severe is CVE-2026-43916?

CVE-2026-43916 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2026-43916 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43916?

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-2026-43916 have an EU (EUVD) identifier?

Yes. CVE-2026-43916 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29474.

When was CVE-2026-43916 published?

CVE-2026-43916 was published on 2026-05-12 and last updated on 2026-06-17.

CVE-2026-43916

CVE-2026-43916 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. 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-125.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29474
Weakness: CWE-125
Published: 2026-05-12
Last modified: 2026-06-17

Description

pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha.

Frequently asked questions

What is CVE-2026-43916?: pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha.
How severe is CVE-2026-43916?: CVE-2026-43916 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2026-43916 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-43916?: 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-2026-43916 have an EU (EUVD) identifier?: Yes. CVE-2026-43916 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29474.
When was CVE-2026-43916 published?: CVE-2026-43916 was published on 2026-05-12 and last updated on 2026-06-17.

References

Other CWE-125 (Out-of-bounds Read) vulnerabilities

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CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
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