Answer in brief
CVE-2026-129217 records a Medium severity (CVSS 6.0) vulnerability in bgpd: out-of-bounds heap read and crash on NOTIFICATION Cease/Hard Reset with one data byte. The current sources do not mark it as known exploited. The current feed maps FRRouting/FRRouting (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps FRRouting/FRRouting (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| FRRouting/FRRoutinggeneric | >=10.5.0 <10.5.2 || >=10.4.0 <10.4.3 || >=10.3 <10.3.4 || >=10.2 <10.2.6 || >=10.1 <10.1.5 || >=8.3 <10.0.5 | 10.5.2, 10.4.3, 10.3.4, 10.2.6, 10.1.5, 10.0.5 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
In FRRouting (FRR) 8.3 through 10.5.1, bgp_notify_decapsulate_hard_reset() in bgpd/bgp_packet.c does not validate the length of the data field of a received BGP NOTIFICATION Cease/Hard Reset message (RFC 8538). When the data field is exactly one byte long, the function reads one byte past the end of a heap buffer and the 16-bit length of the encapsulated data underflows to 65535, causing a 65535-byte out-of-bounds heap read followed by an assertion failure. A remote BGP peer that has established a session and negotiated the Graceful Restart capability with the Notification (N) bit can send such a message to crash the bgpd daemon, terminating all BGP sessions (denial of service). This is fixed in 10.0.5, 10.1.5, 10.2.6, 10.3.4, 10.4.3, 10.5.2 and 10.6.0.
Quoted source text, attributed separately from HOL analysis.