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TI-2026-80118 Aliases CVE-2026-115825GHSA-jmh5-fmfv-h6f8

Large Content-Length header crashes HTTP::Server::PSGI for Perl

Priority MEDIUM 40CWE-789Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-789.

Summary

HTTP::Server::PSGI versions before 1.0056 for Perl are affected. The server allocates a read buffer sized by the declared Content-Length before any body data arrives (CWE-789). A remote attacker can send one request with a large Content-Length and a few body bytes, which makes perl exit with an out-of-memory error and keeps the single-process server down until it is restarted.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

HTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to crash the server by declaring a large Content-Length. The request body is read with sysread() calls sized by the remaining Content-Length. Perl grows the read buffer to the requested length before any data arrives, so the server tries to allocate as much memory as the client declares. A remote attacker can send one request with a large Content-Length and a few body bytes, and perl exits with an out-of-memory error before the application is called. HTTP::Server::PSGI runs as a single process, so the server stays down until restarted.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00655 51st percentileScored 2026-11-07
Fix Fixed Plack: 1.0056

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Plackbefore 1.00561.0056Patch availableCNA
  • Plack Vendor— Affected before 1.0056 Fixed in 1.0056 Patch available CNA

Remediation

Upgrade Plack to version 1.0056, which fixes this flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

  • Fix · CNA Plack Fixed in 1.0056

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-25 Threatist record created from CVE-2026-115825
  2. 2026-10-27 Alias added: GHSA-jmh5-fmfv-h6f8
  3. 2026-10-29 Affected versions changed · Red Hat
  4. 2026-10-29 CVSS score added · Red Hat
  5. 2026-11-02 CVSS score added · CISA ADP
  6. 2026-11-02 CISA SSVC decision points changed
  7. 2026-11-03 EPSS moved to the 50th–90th percentile
  8. 2026-11-04 Priority changed: LOW → MEDIUM

References

Patch 1

Other 1

Sources

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