CVE-2026-43916: CWE-125: Out-of-bounds Read in identd-ng pam_authnft
CVE-2026-43916 is a high-severity vulnerability in the pam_authnft module of identd-ng versions prior to 0.2.0-alpha. It involves a heap buffer over-read caused by improper handling of crafted NETLINK_SOCK_DIAG replies in the peer_lookup_tcp function. This flaw allows reading beyond allocated memory boundaries, potentially leading to information disclosure or application instability. The vulnerability has been fixed in version 0.2.0-alpha. No known exploits are reported in the wild at this time.
AI Analysis
Technical Summary
The pam_authnft PAM session module in identd-ng versions before 0.2.0-alpha contains a heap buffer over-read vulnerability (CWE-125) in the peer_lookup_tcp function (src/peer_lookup.c:134). This occurs because a crafted NETLINK_SOCK_DIAG reply can bypass the message-size check and cause dereferencing beyond the allocated buffer. This vulnerability is addressed in version 0.2.0-alpha of identd-ng.
Potential Impact
Successful exploitation of this vulnerability could lead to out-of-bounds memory reads, which may result in information disclosure or application crashes. The CVSS 4.0 base score is 8.7, indicating a high severity with network attack vector, no privileges or user interaction required, and high impact on availability. There are no reports of active exploitation in the wild.
Mitigation Recommendations
A fix is available in identd-ng version 0.2.0-alpha. Users should upgrade to this version or later to remediate the vulnerability. Since the vendor advisory does not provide additional remediation details, applying the official update is the recommended action. Patch status beyond this is not explicitly confirmed, so users should verify with the vendor for the latest guidance.
CVE-2026-43916: CWE-125: Out-of-bounds Read in identd-ng pam_authnft
Description
CVE-2026-43916 is a high-severity vulnerability in the pam_authnft module of identd-ng versions prior to 0.2.0-alpha. It involves a heap buffer over-read caused by improper handling of crafted NETLINK_SOCK_DIAG replies in the peer_lookup_tcp function. This flaw allows reading beyond allocated memory boundaries, potentially leading to information disclosure or application instability. The vulnerability has been fixed in version 0.2.0-alpha. No known exploits are reported in the wild at this time.
CVSS v4.0
Score 8.7high
Affected software
pkg:github/identd-ng/pam_authnftRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The pam_authnft PAM session module in identd-ng versions before 0.2.0-alpha contains a heap buffer over-read vulnerability (CWE-125) in the peer_lookup_tcp function (src/peer_lookup.c:134). This occurs because a crafted NETLINK_SOCK_DIAG reply can bypass the message-size check and cause dereferencing beyond the allocated buffer. This vulnerability is addressed in version 0.2.0-alpha of identd-ng.
Potential Impact
Successful exploitation of this vulnerability could lead to out-of-bounds memory reads, which may result in information disclosure or application crashes. The CVSS 4.0 base score is 8.7, indicating a high severity with network attack vector, no privileges or user interaction required, and high impact on availability. There are no reports of active exploitation in the wild.
Mitigation Recommendations
A fix is available in identd-ng version 0.2.0-alpha. Users should upgrade to this version or later to remediate the vulnerability. Since the vendor advisory does not provide additional remediation details, applying the official update is the recommended action. Patch status beyond this is not explicitly confirmed, so users should verify with the vendor for the latest guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-04T16:11:33.086Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0333e5cbff5d8610ef1d3a
Added to database: 05/12/2026, 14:06:29 UTC
Last enriched: 05/19/2026, 18:45:49 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 105
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