PoC Index

CVE-2026-45185

CRITICAL 9.8EPSS 1.2%

Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.

CVSS v3.1
9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
1.23% chance of exploitation in the next 30 days, 67th percentile
Published
2026-05-12
Updated
2026-05-14

Proof-of-concept exploits (2)

References

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