CVE-2026-40553

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory published 2026-07-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and below.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Jul 13, 2026
No patch confirmed yet.
generic

Avoid buffer overflow in extension/readdir.c. - gawk.git - gawk

https://cgit.git.savannah.gnu.org/cgit/gawk.git/commit/?id=cca0366144336b49aaa7d5d949966ce8e2c70843
generic

Vulnerabilities in GNU gawk software | CERT Polska

https://cert.pl/en/posts/2026/07/CVE-2026-40467

Vendor Advisories for CVE-2026-40553(4)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntugawk (1:5.3.2-1ubuntu1.1) @ resolute2026-08-30ubuntu
redhatgawk-main-5.4.1-1.hum12026-08-03redhat
redhatgawk-main-5.4.0-3.1.hum12026-07-15redhat

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
gawk1:5.1.0-1, 1:5.2.1-1, 1:5.2.1-2, 1:5.3.2-1——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
gawk1:5.2.1-2, 1:5.3.2-1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
gawk1:5.2.1-2, 1:5.3.2-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
gawk1:5.2.1-2, 1:5.3.2-1——

Weakness Classification(1)

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 30× in last 7d / 166× 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 219 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-40553?
CVE-2026-40553 is a high vulnerability published on July 13, 2026. Buffer overflow vulnerability has been found in "extension/readdir.c" program file of gawk (ftype() routine). This issue could be used to crash the program and potentially to achieve code execution, although the latter has not been confirmed to be feasible. It affects gawk in versions 5.4.0 and…
When was CVE-2026-40553 disclosed?
CVE-2026-40553 was first published in the National Vulnerability Database on July 13, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40553 actively exploited?
CVE-2026-40553 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 78.9% of all scored CVEs.
What is the CVSS score of CVE-2026-40553?
CVE-2026-40553 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-40553?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40553, 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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