CVE-2026-8368

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-05-12. 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.

LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects.

On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.

A redirect to an attacker controlled host therefore discloses the caller's credentials to that host.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
18.1%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 19, 2026

Advisory Details (4)

Auto-updated Jun 12, 2026
No patch confirmed yet. Sources: github_pr.
generic

oss-security - CVE-2026-8368: LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects

http://www.openwall.com/lists/oss-security/2026/05/12/7
generic

Changes - metacpan.org

https://metacpan.org/release/OALDERS/libwww-perl-6.83/changes
github_pr

Do not forward the Authentication header after 3xx

Upstream fix in progress (PR #284 · libwww-perl/libwww-perl, state=closed)

https://github.com/libwww-perl/libwww-perl/pull/284
generic
https://github.com/libwww-perl/libwww-perl/commit/9c4aeb6f2dd32f2b7eaf2d7827cade31ea6cb2c6.patch

Vendor Advisories for CVE-2026-8368(2)

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
ubuntulibwww-perl (6.81-1ubuntu0.1) @ resolute2026-06-28ubuntu

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.

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 9× in last 7d / 56× 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 118 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-8368?
CVE-2026-8368 is a medium vulnerability published on May 12, 2026. LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects. On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent…
When was CVE-2026-8368 disclosed?
CVE-2026-8368 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8368 actively exploited?
CVE-2026-8368 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8368?
CVE-2026-8368 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-8368?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8368, 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

Explore the affected products and dependency analysis for CVE-2026-8368

Explore →

Is Your Infrastructure Affected by CVE-2026-8368?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs