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
Trending — 4 sources updated this week
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

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)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
71%
KEV
Not listed

Published

May 27, 2026

Last Modified

July 23, 2026

Advisory Details (10)

Auto-updated Sep 16, 2026
Patch available. Sources: github_pr, redhat.
redhat Patch Available

2481773 – (CVE-2026-8450) CVE-2026-8450 perl-HTTP-Daemon: HTTP::Daemon: Arbitrary code execution via OS command injection in send_file()

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2481773
redhat Patch Available

CVE-2026-8450 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-8450
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:36189
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:36188
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:36187
generic Patch Available

[SECURITY] [DLA 4639-1] libhttp-daemon-perl security update

https://lists.debian.org/debian-lts-announce/2026/06/msg00028.html
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

Client Challenge

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(2)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibhttp-daemon-perl (6.01-1ubuntu0.14.04~esm2) @ trusty2026-09-14ubuntu
redhatperl-HTTP-Daemon-0:6.16-7.el10_2.12026-07-07redhat
redhatperl-HTTP-Daemon-0:6.01-24.el8_102026-07-07redhat
redhatperl-HTTP-Daemon-0:6.12-6.el9_8.12026-07-07redhat

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
libhttp-daemon-perl6.12-1, 6.12-1+deb11u16.12-1+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libhttp-daemon-perl6.16-16.16-1+deb13u1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libhttp-daemon-perl6.16-1, 6.16-1+deb13u1~deb12u16.16-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libhttp-daemon-perl6.16-16.17-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(4)

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 / 44× 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 469 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 23, 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 1% probability of exploitation in the next 30 days, which ranks it in the top 28.8% of all scored CVEs.
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.

Dependency Blast Radius

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