CVE-2026-28532

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.5 from GitHub Security Advisory published 2026-04-30. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-26418 (ENISA EUVD) · GHSA-wjc3-2qjv-c8fp (GitHub Security Advisories)Source: ENISA EUVD

6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segment Routing TLV parser functions where a uint16_t accumulator variable truncates uint32_t values returned by the TLV_SIZE() macro, causing the loop termination condition to fail while pointer advancement continues unchecked. Attackers with an established OSPF adjacency can send a crafted LS Update packet with a malicious Type 10 or Type 11 Opaque LSA to trigger out-of-bounds memory reads and crash all affected routers in the OSPF area or autonomous system.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
13th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 30, 2026

Last Modified

October 26, 2026

Advisory Details (4)

Auto-updated Apr 30, 2026
Patch available.
Web page

FRRouting < 10.5.3 Integer Overflow in OSPF TLV Parser Functions | Advisories | VulnCheck

https://www.vulncheck.com/advisories/frrouting-integer-overflow-in-ospf-tlv-parser-functions
Web page

Release FRR Release 10.5.3 · FRRouting/frr · GitHub

https://github.com/FRRouting/frr/releases/tag/frr-10.5.3
Web page

ospfd: harden TE/SR TLV iteration against malformed lengths by Jafaral · Pull Request #21002 · FRRouting/frr · GitHub

https://github.com/FRRouting/frr/pull/21002
Web page

Merge pull request #21002 from Jafaral/ospf-fix · FRRouting/frr@f098dec · GitHub

https://github.com/FRRouting/frr/commit/f098decf02987fbf1c891766c1516ac832adadfd

Vendor Advisories for CVE-2026-28532(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntufrr-snmp (10.4.1-3ubuntu1.4) @ questing2026-10-29ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
frr10.0-0.1 ... 9.1-0.1 (59 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
frr8.4.2-1, 8.4.4-1, 8.4.4-1.1~deb12u1
  • every version up to 8.4.4-1.1~deb12u2: fixed in 8.4.4-1.1~deb12u2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
frr10.3-3
  • every version up to 10.3-3+deb13u1: fixed in 10.3-3+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
frr10.3-3 ... 10.5.2-1 (17 versions)
  • every version up to 10.5.3-1: fixed in 10.5.3-1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 46× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 95 of 281 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 186 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-10-29 16:11 UTCEG score recompute
  3. 2026-10-29 16:11 UTCVendor advisory
  4. 2026-10-29 16:11 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  5. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  7. 2026-10-26 22:47 UTCEG score recompute
  8. 2026-10-26 22:46 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  11. 2026-10-25 14:37 UTCEG score recompute
  12. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-10-23 03:59 UTCEG score recompute
  15. 2026-10-23 03:59 UTCVendor advisory
  16. 2026-10-23 03:59 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  17. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  18. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  20. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  21. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  22. 2026-10-18 03:50 UTCEG score recompute
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  24. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  25. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
Show 70 more
  1. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  4. 2026-10-12 16:16 UTCEG score recompute
  5. 2026-10-11 19:58 UTCEG score recompute
  6. 2026-10-11 17:12 UTCEG score recompute
  7. 2026-10-11 14:42 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  15. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  16. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  17. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-01 15:31 UTCEG score recompute
  19. 2026-10-01 15:31 UTCVendor advisory
  20. 2026-10-01 15:31 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-09-23 06:45 UTCOSV refresh
  26. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  27. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  28. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  29. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  30. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  31. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  32. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  33. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  34. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  36. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  38. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  39. 2026-09-04 01:16 UTCOSV refresh
  40. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  41. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  42. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  43. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  44. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  45. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  46. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  47. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  48. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  49. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  50. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  51. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  52. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  53. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  54. 2026-08-17 13:48 UTCEG score recompute
  55. 2026-08-17 13:48 UTCVendor advisory
  56. 2026-08-17 13:48 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  57. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  58. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  59. 2026-08-16 05:21 UTCEG score recompute
  60. 2026-08-16 05:21 UTCVendor advisory
  61. 2026-08-16 05:21 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  62. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  63. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  64. 2026-08-14 03:49 UTCEG score recompute
  65. 2026-08-14 03:49 UTCVendor advisory
  66. 2026-08-14 03:49 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5
  67. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  68. 2026-08-12 17:27 UTCEG score recompute
  69. 2026-08-12 17:27 UTCVendor advisory
  70. 2026-08-12 17:27 UTCGHSA enrichmentGHSA-wjc3-2qjv-c8fp · GitHub CVSS 6.5

Frequently asked(5)

What is CVE-2026-28532?
CVE-2026-28532 is a medium-severity vulnerability; its CVE record was published on April 30, 2026. FRRouting before 10.5.3 contains an integer overflow vulnerability in seven OSPF Traffic Engineering and Segment Routing TLV parser functions where a uint16t accumulator variable truncates uint32t values returned by the TLV_SIZE() macro, causing the loop termination condition to fail while pointer…
When was CVE-2026-28532 made public?
CVE-2026-28532 was made public on March 5, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on April 30, 2026. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-28532 actively exploited?
CVE-2026-28532 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (13th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-28532?
CVE-2026-28532 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-28532?
A fix for CVE-2026-28532 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-28532 are linked in the Vendor Advisories panel on this page.

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