CVE catalog

CVE-2026-94453

Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tupl

[CVE catalog]

Severity
High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.45% · Oct 25, 2026

Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianlibreswansid5.2-2.5vulnerable
Debianlibreswanforky5.2-2.5vulnerable
Debianlibreswantrixie5.2-2.2vulnerable
Debianlibreswanbookworm4.10-2+deb12u1vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianlibreswansourcesid(unfixed)not yet assignedNot reported[1150899]
Debianlibreswansourceforky(unfixed)not yet assignedNot reported[1150899]
Debianlibreswansourcetrixie(unfixed)not yet assignedNot reported[1150899]
Debianlibreswansourcebookworm(unfixed)not yet assignedNot reported[1150899]

[Debian bug #1150899]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libreswan]Affected
    Details (2)

    • 4.10-2+deb12u1 · amd64 · bookworm

      Affected

      nvd · libreswan · debian · bookworm; nvd · libreswan · debian · 12

    • 4.10-2+deb12u1 · arm64 · bookworm

      Affected

      nvd · libreswan · debian · bookworm; nvd · libreswan · debian · 12

[Debian 13 (Trixie)]

  • [libreswan]Affected
    Details (2)

    • 5.2-2.2 · amd64 · trixie

      Affected

      nvd · libreswan · debian · 13

    • 5.2-2.2 · arm64 · trixie

      Affected

      nvd · libreswan · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]