CVE Explorer
CVE-2026-49943
CZ.NIC BIRD Internet Routing Daemon through 2.19.0 contains a stack-based buffer overflow in the BGP AS_PATH mask matching implementation in nest/a-path.c. The as_path_match() function uses a fixed-size stack array of 2048 + 1 pm_pos entries, while parse_path() expands AS_PATH segments from a received BGP UPDATE without enforcing a corresponding capacity limit. When RFC 8654 BGP Extended Messages are enabled and a BIRD filter evaluates an AS path mask expression such as "bgp_path ~ [= ... =]", a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unknown","product":"BIRD","vendor":"NIC","versions":[{"lessThanOrEqual":"2.19.0","status":"affected","version":"0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:a4fcd155ddb8b165dd14f49078ddd47284bdbd1e215527186ea3dd4bf5a5f7d2 · sha256:2f37527a4a73fb41… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:a4fcd155ddb8b165dd14f49078ddd47284bdbd1e215527186ea3dd4bf5a5f7d2 · sha256:2f37527a4a73fb41… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-121","description":"CWE-121 Stack-based Buffer Overflow","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:a4fcd155ddb8b165dd14f49078ddd47284bdbd1e215527186ea3dd4bf5a5f7d2 · sha256:2f37527a4a73fb41… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"url":"https://bird.nic.cz"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a4fcd155ddb8b165dd14f49078ddd47284bdbd1e215527186ea3dd4bf5a5f7d2 · sha256:2f37527a4a73fb41… · /containers/cna/references/0
{"url":"https://gitlab.nic.cz/labs/bird/-/blob/master/NEWS"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:a4fcd155ddb8b165dd14f49078ddd47284bdbd1e215527186ea3dd4bf5a5f7d2 · sha256:2f37527a4a73fb41… · /containers/cna/references/1
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.