CVE-2026-6238

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-04-28. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response, causing a target application to crash or read uninitialized memory.

These functions are for application debugging only and hence not in the path of code executed by the DNS resolver. Further, they have been deprecated since version 2.34 and should not be used by any new applications. Applications should consider porting away from these interfaces since they may be removed in future versions.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
28.0%
KEV
Not listed

Published

April 28, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated May 4, 2026
No patch confirmed yet.
generic

34069 – (CVE-2026-6238) Buffer overread in ns_sprintrrf with corrupted RDATA field (CVE-2026-6238)

https://sourceware.org/bugzilla/show_bug.cgi?id=34069
generic

The GNU C Library security advisories update for 2026-04-28

https://inbox.sourceware.org/libc-announce/[email protected]/T/#u

Vendor Advisories for CVE-2026-6238(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
redhatglibc-main-2.42-12.hum12026-05-01redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 45× 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 120 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-6238?
CVE-2026-6238 is a medium vulnerability published on April 28, 2026. The deprecated functions nsprintrrf, nsprintrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records, which may allow an attacker to craft a DNS response,…
When was CVE-2026-6238 disclosed?
CVE-2026-6238 was first published in the National Vulnerability Database on April 28, 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-2026-6238 actively exploited?
CVE-2026-6238 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6238?
CVE-2026-6238 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-6238?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6238, 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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