CVE-2026-6238

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-04-28. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 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)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
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(11)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatinsights-proxy/insights-proxy-container-rhel9:17864336562026-08-11redhat
redhatdiscovery/discovery-server-rhel9:17848216702026-07-27redhat
redhatrhui5/rhua-rhel9:17847950762026-07-23redhat
redhatrhosdt/tempo-rhel9-operator:17847757822026-07-23redhat
redhatglibc-0:2.34-274.el9_82026-07-22redhat
redhatglibc-0:2.28-251.el8_10.402026-07-21redhat
redhatglibc-0:2.39-128.el10_22026-07-21redhat
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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
glibc2.31-13 ... 2.43-2 (208 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
glibc2.36-10~0 ... 2.44-1 (130 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
glibc2.41-12 ... 2.44-1 (36 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
glibc2.41-12 ... 2.43-2 (27 versions)2.43-3—

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 4× in last 7d / 22× 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 211 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 70.4% of all scored CVEs.
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.

Dependency Blast Radius

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