CVE-2026-56289

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-09. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing loop while attempting to locate the requested position. This results in excessive CPU consumption and prevents the process from completing. An attacker can trigger this behavior by supplying a malicious patch file, causing the utility to become unresponsive and require manual termination.

This issue has been fixed in the commit faba04ef4f2b410257f76c1b9dc85e350929c4b9

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 13, 2026

Advisory Details (1)

Auto-updated Jul 9, 2026
No patch confirmed yet.
generic

Vulnerabilities in GNU patch software | CERT Polska

https://cert.pl/en/posts/2026/07/CVE-2026-56288

Vendor Advisories for CVE-2026-56289(3)

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 / EcosystemFixed in / PatchReleasedSource
redhatpatch-main-2.8-4.2.hum12026-07-10redhat

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 rangeFixed inDependents
patch2.7.6-7, 2.8-1, 2.8-2——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
patch2.7.6-7, 2.8-1, 2.8-2——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
patch2.8-2——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
patch2.8-2——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 106× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 148 total refreshes for this CVE.

  1. 2026-08-27 14:25 UTCEPSS rescore
  2. 2026-08-27 03:14 UTCEG score recompute
  3. 2026-08-27 03:14 UTCVendor advisory
  4. 2026-08-27 03:14 UTCGHSA enrichment
  5. 2026-08-26 14:46 UTCEPSS rescore
  6. 2026-08-26 03:55 UTCEG score recompute
  7. 2026-08-26 03:55 UTCVendor advisory
  8. 2026-08-26 03:55 UTCGHSA enrichment
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 22:24 UTCEG score recompute
  11. 2026-08-24 22:24 UTCVendor advisory
  12. 2026-08-24 22:24 UTCGHSA enrichment
  13. 2026-08-23 23:05 UTCEG score recompute
  14. 2026-08-23 23:05 UTCVendor advisory
  15. 2026-08-23 23:05 UTCGHSA enrichment
  16. 2026-08-23 00:19 UTCEPSS rescore
  17. 2026-08-22 23:47 UTCVendor advisory
  18. 2026-08-22 23:47 UTCGHSA enrichment
  19. 2026-08-22 00:28 UTCEG score recompute
  20. 2026-08-22 00:28 UTCVendor advisory
  21. 2026-08-22 00:28 UTCGHSA enrichment
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-21 01:09 UTCEG score recompute
  24. 2026-08-21 01:09 UTCVendor advisory
  25. 2026-08-21 01:09 UTCGHSA enrichment
Show 75 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 01:51 UTCEG score recompute
  3. 2026-08-20 01:51 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-18 22:27 UTCEG score recompute
  6. 2026-08-18 22:27 UTCVendor advisory
  7. 2026-08-18 22:27 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 22:39 UTCEG score recompute
  10. 2026-08-17 22:39 UTCVendor advisory
  11. 2026-08-17 22:39 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 23:19 UTCEG score recompute
  14. 2026-08-16 23:19 UTCVendor advisory
  15. 2026-08-16 23:19 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-16 00:01 UTCEG score recompute
  19. 2026-08-16 00:01 UTCVendor advisory
  20. 2026-08-16 00:01 UTCGHSA enrichment
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-15 00:42 UTCVendor advisory
  23. 2026-08-15 00:42 UTCGHSA enrichment
  24. 2026-08-14 01:23 UTCEG score recompute
  25. 2026-08-14 01:23 UTCVendor advisory
  26. 2026-08-14 01:23 UTCGHSA enrichment
  27. 2026-08-13 22:00 UTCEPSS rescore
  28. 2026-08-13 02:05 UTCEG score recompute
  29. 2026-08-13 02:05 UTCGHSA enrichment
  30. 2026-08-12 13:51 UTCEPSS rescore
  31. 2026-08-12 02:47 UTCEG score recompute
  32. 2026-08-12 02:47 UTCVendor advisory
  33. 2026-08-12 02:47 UTCGHSA enrichment
  34. 2026-08-11 03:28 UTCEG score recompute
  35. 2026-08-11 03:28 UTCVendor advisory
  36. 2026-08-11 03:28 UTCGHSA enrichment
  37. 2026-08-11 00:00 UTCEPSS rescore
  38. 2026-08-10 04:10 UTCEG score recompute
  39. 2026-08-10 04:10 UTCGHSA enrichment
  40. 2026-08-09 13:46 UTCEPSS rescore
  41. 2026-08-09 04:52 UTCEG score recompute
  42. 2026-08-09 04:52 UTCGHSA enrichment
  43. 2026-08-08 16:37 UTCEPSS rescore
  44. 2026-08-08 05:34 UTCEG score recompute
  45. 2026-08-08 05:34 UTCVendor advisory
  46. 2026-08-08 05:34 UTCGHSA enrichment
  47. 2026-08-07 06:15 UTCEG score recompute
  48. 2026-08-07 06:15 UTCVendor advisory
  49. 2026-08-07 06:15 UTCGHSA enrichment
  50. 2026-08-06 13:47 UTCEPSS rescore
  51. 2026-08-06 06:56 UTCEG score recompute
  52. 2026-08-06 06:56 UTCVendor advisory
  53. 2026-08-06 06:56 UTCGHSA enrichment
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-05 07:38 UTCVendor advisory
  56. 2026-08-05 07:38 UTCGHSA enrichment
  57. 2026-08-04 08:19 UTCEG score recompute
  58. 2026-08-04 08:19 UTCGHSA enrichment
  59. 2026-08-03 10:36 UTCEPSS rescore
  60. 2026-08-03 08:18 UTCVendor advisory
  61. 2026-08-03 08:17 UTCGHSA enrichment
  62. 2026-08-02 08:59 UTCEG score recompute
  63. 2026-08-02 08:59 UTCVendor advisory
  64. 2026-08-02 08:59 UTCGHSA enrichment
  65. 2026-08-02 02:27 UTCEPSS rescore
  66. 2026-08-01 09:40 UTCEG score recompute
  67. 2026-08-01 09:40 UTCVendor advisory
  68. 2026-08-01 09:40 UTCGHSA enrichment
  69. 2026-08-01 04:16 UTCEPSS rescore
  70. 2026-07-31 10:21 UTCEG score recompute
  71. 2026-07-31 10:21 UTCVendor advisory
  72. 2026-07-31 10:21 UTCGHSA enrichment
  73. 2026-07-30 16:28 UTCEPSS rescore
  74. 2026-07-30 11:02 UTCEG score recompute
  75. 2026-07-30 11:02 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56289?
CVE-2026-56289 is a medium vulnerability published on July 9, 2026. GNU patch is vulnerable to a denial of service (DoS) due to improper validation of hunk (single block of changes in diff) line offsets in unified-diff input. A specially crafted patch can specify an extremely large line number, causing the application to enter an effectively infinite processing…
When was CVE-2026-56289 disclosed?
CVE-2026-56289 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56289 actively exploited?
CVE-2026-56289 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.7% of all scored CVEs.
What is the CVSS score of CVE-2026-56289?
CVE-2026-56289 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-56289?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56289, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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