CVE-2026-8450

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-27. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file().

send_file() opens its string argument with Perl's 2-arg open(). The 2-arg form interprets magic prefixes: '| cmd' and 'cmd |' open a pipe to a subprocess, '> path' and '>> path' open the path for write or append.

Untrusted input passed to send_file() can run OS commands at the daemon process UID. The read-pipe form ('cmd |') also leaks subprocess stdout into the HTTP response body. The write-mode forms can create or truncate files at attacker chosen paths.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
70.4%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 15, 2026

Advisory Details (4)

Auto-updated May 28, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

oss-security - CVE-2026-8450: HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file()

http://www.openwall.com/lists/oss-security/2026/05/27/5
generic

Changes - metacpan.org

https://metacpan.org/release/OALDERS/HTTP-Daemon-6.17/changes
github_pr

Fix CVE-2026-8450: send_file() honoured 2-arg open() shell-magic

Fix merged in libwww-perl/HTTP-Daemon PR #89 on 2026-05-19 — awaiting tagged release

https://github.com/libwww-perl/HTTP-Daemon/pull/89
generic
https://github.com/libwww-perl/HTTP-Daemon/commit/945d35141d94490f749640bd4390acd6a2193995.patch

Vendor Advisories for CVE-2026-8450(1)

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
ubuntulibhttp-daemon-perl (6.06-1ubuntu0.1+esm1) @ focal2026-07-01ubuntu

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(2)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 121× 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 343 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-8450?
CVE-2026-8450 is a critical vulnerability published on May 27, 2026. HTTP::Daemon versions before 6.17 for Perl allow OS command injection via send_file(). send_file() opens its string argument with Perl's 2-arg open(). The 2-arg form interprets magic prefixes: '| cmd' and 'cmd |' open a pipe to a subprocess, '> path' and '>> path' open the path for write or append.…
When was CVE-2026-8450 disclosed?
CVE-2026-8450 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8450 actively exploited?
CVE-2026-8450 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8450?
CVE-2026-8450 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8450?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8450, 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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