CVE-2026-40553

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, NVD CVSS v3
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.3% × 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
0.3%
EPSS %ILE
20th
KEV
Not listed

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

July 13, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Jul 13, 2026
Patch available.
Web page

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

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

Vulnerabilities in GNU gawk software | CERT Polska

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

Vendor Advisories for CVE-2026-40553(7)

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

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntugawk (1:5.3.2-1ubuntu1.1) @ resolute2026-10-01ubuntu
redhatgawk-0:5.3.0-6.el10_2.12026-09-29redhat
redhatgawk-0:5.1.0-6.el9_8.12026-09-29redhat
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 rangeFix by version rangeDependents
gawk1:5.1.0-1, 1:5.2.1-1, 1:5.2.1-2, 1:5.3.2-1
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
gawk1:5.2.1-2, 1:5.3.2-1
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gawk1:5.2.1-2, 1:5.3.2-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gawk1:5.2.1-2, 1:5.3.2-1
  • every version on: no fix on record
—

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 11× in last 7d / 41× 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 99 of 297 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 198 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-10-12 16:09 UTCEG score recompute
  4. 2026-10-11 19:51 UTCEG score recompute
  5. 2026-10-11 17:05 UTCEG score recompute
  6. 2026-10-11 14:31 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-10-01 14:17 UTCEG score recompute
  18. 2026-10-01 14:17 UTCVendor advisory
  19. 2026-10-01 14:17 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  21. 2026-09-28 09:31 UTCEG score recompute
  22. 2026-09-28 09:31 UTCVendor advisory
  23. 2026-09-28 09:31 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  25. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 37th percentile
Show 74 more
  1. 2026-09-24 10:06 UTCEG score recompute
  2. 2026-09-24 10:06 UTCVendor advisory
  3. 2026-09-24 10:06 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  4. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  5. 2026-09-23 05:25 UTCEG score recompute
  6. 2026-09-23 05:25 UTCVendor advisory
  7. 2026-09-23 05:25 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  8. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-09-18 05:02 UTCEG score recompute
  11. 2026-09-18 05:02 UTCVendor advisory
  12. 2026-09-18 05:02 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  13. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-09-14 11:07 UTCVendor advisory
  18. 2026-09-14 11:07 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  19. 2026-09-13 23:32 UTCEG score recompute
  20. 2026-09-13 23:32 UTCVendor advisory
  21. 2026-09-13 23:32 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  22. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-09-13 08:00 UTCEG score recompute
  24. 2026-09-13 08:00 UTCVendor advisory
  25. 2026-09-13 08:00 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  26. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  27. 2026-09-12 13:27 UTCVendor advisory
  28. 2026-09-12 13:27 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  29. 2026-09-12 01:52 UTCEG score recompute
  30. 2026-09-12 01:52 UTCVendor advisory
  31. 2026-09-12 01:52 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  32. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  33. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  34. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  36. 2026-09-08 01:57 UTCEG score recompute
  37. 2026-09-08 01:57 UTCVendor advisory
  38. 2026-09-08 01:57 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  39. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  40. 2026-09-06 13:50 UTCEG score recompute
  41. 2026-09-06 13:50 UTCVendor advisory
  42. 2026-09-06 13:50 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  43. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  44. 2026-09-05 21:25 UTCEG score recompute
  45. 2026-09-05 21:25 UTCVendor advisory
  46. 2026-09-05 21:25 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  47. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  48. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  49. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  50. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  52. 2026-08-30 16:57 UTCVendor advisory
  53. 2026-08-30 16:57 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  54. 2026-08-30 05:29 UTCEG score recompute
  55. 2026-08-30 05:29 UTCVendor advisory
  56. 2026-08-30 05:29 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  57. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  58. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-08-28 02:32 UTCEG score recompute
  60. 2026-08-28 02:32 UTCVendor advisory
  61. 2026-08-28 02:32 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  62. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  63. 2026-08-27 14:02 UTCVendor advisory
  64. 2026-08-27 14:01 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  65. 2026-08-27 01:21 UTCEG score recompute
  66. 2026-08-27 01:21 UTCVendor advisory
  67. 2026-08-27 01:20 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  68. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  69. 2026-08-26 13:52 UTCVendor advisory
  70. 2026-08-26 13:52 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  71. 2026-08-26 02:23 UTCEG score recompute
  72. 2026-08-26 02:23 UTCVendor advisory
  73. 2026-08-26 02:23 UTCGHSA enrichmentGHSA-3j4c-7g5m-7rg5 · GitHub CVSS 7.5
  74. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile

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Frequently asked(5)

What is CVE-2026-40553?
CVE-2026-40553 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-40553 was made public on July 13, 2026: that is the date its CVE record's CNA, CERT.PL, gives for when the vulnerability was made public. The CVE record itself was published on July 13, 2026. EchelonGraph's copy of the record carries a last-modified date of July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-40553 actively exploited?
CVE-2026-40553 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-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?
A fix for CVE-2026-40553 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-40553 are linked in the Vendor Advisories panel on this page.

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