CVE Explorer
CVE-2026-40356
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to terminate in parse_message.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Kerberos 5","vendor":"MIT","versions":[{"lessThan":"1.22.3","status":"affected","version":"1.18","versionType":"custom"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:ecf7917a55870297ecd823a3163104a33997a60239ea772e285640456740f319 · sha256:d53cba1bdc9a7bf9… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:ecf7917a55870297ecd823a3163104a33997a60239ea772e285640456740f319 · sha256:d53cba1bdc9a7bf9… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-191","description":"CWE-191 Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:ecf7917a55870297ecd823a3163104a33997a60239ea772e285640456740f319 · sha256:d53cba1bdc9a7bf9… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"url":"https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ecf7917a55870297ecd823a3163104a33997a60239ea772e285640456740f319 · sha256:d53cba1bdc9a7bf9… · /containers/cna/references/1
{"url":"https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ecf7917a55870297ecd823a3163104a33997a60239ea772e285640456740f319 · sha256:d53cba1bdc9a7bf9… · /containers/cna/references/2
{"url":"https://web.mit.edu/kerberos/advisories/"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:ecf7917a55870297ecd823a3163104a33997a60239ea772e285640456740f319 · sha256:d53cba1bdc9a7bf9… · /containers/cna/references/0
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.