CVE-2022-26129

Memory corruption via malformed Babel sub-TLV lengths

Published Mar 3, 2022 · Updated Nov 4, 2025

Buffer overflow in FRRouting through 8.1.0 allows attackers to corrupt babeld memory by sending malformed Babel sub-TLVs. The parse_hello_subtlv, parse_ihu_subtlv, and parse_update_subtlv functions omit header bytes from bounds calculations and read beyond truncated input. Reachability requires babeld to process the crafted packet; public sources establish out-of-bounds access but not a specific crash, disclosure, or code-execution outcome.

CVSS severity7.8
High
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in FRRouting through 8.1.0 allows attackers to corrupt babeld memory by sending malformed Babel sub-TLVs. The parse_hello_subtlv, parse_ihu_subtlv, and parse_update_subtlv functions omit header bytes from bounds calculations and read beyond truncated input. Reachability requires babeld to process the crafted packet; public sources establish out-of-bounds access but not a specific crash, disclosure, or code-execution outcome.

The record

CVE
CVE-2022-26129
Published
Mar 3, 2022
Updated
Nov 4, 2025
Vendor
FRRouting
Product
FRRouting
Classifications
CWE-119
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 3, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=8.10
  2. Affected versionversion=through 8.1.0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

FRRouting · FRRoutingversion=0 <=8.10; version=through 8.1.0

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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