CVE-2026-31908

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-14. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Header injection vulnerability in Apache APISIX.

The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0.

Users are recommended to upgrade to version 3.16.0, which fixes the issue.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

April 14, 2026

Last Modified

April 17, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-31908: Apache APISIX: forward auth plugin allows header injection

http://www.openwall.com/lists/oss-security/2026/04/14/3
generic
https://lists.apache.org/thread/sob643s5lztov7x579j8o0c444t36n6b

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 55× 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 244 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-31908?
CVE-2026-31908 is a critical vulnerability published on April 14, 2026. Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue.
When was CVE-2026-31908 disclosed?
CVE-2026-31908 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31908 actively exploited?
CVE-2026-31908 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.6% of all scored CVEs.
What is the CVSS score of CVE-2026-31908?
CVE-2026-31908 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-31908?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31908, 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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