CVE-2026-28532

OSPF daemon crash via TLV length wraparound

Published Apr 30, 2026 · Updated Apr 30, 2026

Integer overflow in FRRouting before 10.5.3 allows attackers with an OSPF adjacency to crash the OSPF daemon via opaque LSAs. Seven Traffic Engineering and Segment Routing TLV parsers store 32-bit TLV_SIZE() results in 16-bit loop counters, allowing wraparound while pointer advancement continues beyond the LSA buffer. A malicious Type 10 or Type 11 LS Update from an established neighbor can crash every affected router in the OSPF area or autonomous system.

CVSS severity6.0
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in FRRouting before 10.5.3 allows attackers with an OSPF adjacency to crash the OSPF daemon via opaque LSAs. Seven Traffic Engineering and Segment Routing TLV parsers store 32-bit TLV_SIZE() results in 16-bit loop counters, allowing wraparound while pointer advancement continues beyond the LSA buffer. A malicious Type 10 or Type 11 LS Update from an established neighbor can crash every affected router in the OSPF area or autonomous system.

The record

CVE
CVE-2026-28532
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
FRRouting
Product
FRRouting
Classifications
CWE-125, CWE-190, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2026Record 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 <=10.5.3

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

FRRouting · FRRoutingversion=0 <=10.5.3

Published CVSS scores

6.0VulnCheckCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5VulnCheckCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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