CVE Explorer
CVE-2026-45185
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.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Exim","vendor":"Exim","versions":[{"lessThan":"4.99.3","status":"affected","version":"4.97","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-416","description":"CWE-416 Use After Free","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/problemTypes/0/descriptions/0
Source references
8 source assertions{"url":"http://www.openwall.com/lists/oss-security/2026/05/12/25"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/adp/0/references/0
{"url":"https://code.exim.org/exim/wiki/wiki/EximSecurity"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/1
{"url":"https://exim.org"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/0
{"url":"https://exim.org/static/doc/security/CVE-2026-45185.txt"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/2
{"url":"https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/6
{"url":"https://news.ycombinator.com/item?id=48111748"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/4
{"url":"https://www.openwall.com/lists/oss-security/2026/05/12/4"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/5
{"url":"https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:41b89c0a0d8d823e169daa5e05e420ea231879278c3f8fb941e98e431f77d9b0 · sha256:eeb52a1e901ec4dc… · /containers/cna/references/3
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.