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No exploitation reportedFix available

CVE-2026-115823

Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections

No exploitation reported by the sources we read.

  • Published2026-10-25
  • WeaknessCWE-444

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections. For a HEAD request Starman omits chunked framing but still writes the body returned by the application, on both the array and streaming response paths. Responses with a 1xx, 204 or 304 status also carry the body. On a keep-alive or pipelined connection the client reads those bytes as the start of the next response. A front-end proxy that reuses upstream connections may then pair responses with the wrong requests.

Timeline

dates in UTC
  1. 2026-10-2516:51CVE publishedCNA

Observed activity

isMalicious corpus · updated 2026-11-02 15:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-115823?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-115823?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

Products declared by the CNA1 product

As CPANSec, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-10-25

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • perl-StarmanopenSUSE:Tumbleweedall versions · fixed in 0.4019-1.1
  • starmanUbuntu:26.10all versions · no fixed version listed
  • starmanUbuntu:26.04:LTSall versions · no fixed version listed
  • starmanUbuntu:24.04:LTSall versions · no fixed version listed
  • starmanUbuntu:22.04:LTSall versions · no fixed version listed
  • starmanUbuntu:20.04:LTSall versions · no fixed version listed
  • starmanUbuntu:18.04:LTSall versions · no fixed version listed
  • starmanUbuntu:16.04:LTSall versions · no fixed version listed

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-115823 Red Hat Product Security

    perl-starman: perl-starman: HTTP response desynchronization via improper response body handling

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
2026-10-25
Last Modified
2026-11-02
NVD status
Deferred
GitHub Advisory
GHSA-4q75-5w63-6hx7

Frequently asked questions

What is CVE-2026-115823?

Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections. For a HEAD request Starman omits chunked framing but still writes the body returned by the application, on both the array and streaming response paths. Responses with a 1xx, 204 or 304 status also carry the body. On a keep-alive or pipelined connection the client reads those bytes as the start of the next response. A front-end proxy that reuses upstream connections may then pair responses with the wrong requests.

Is CVE-2026-115823 actively exploited?

Active exploitation of CVE-2026-115823 has not been confirmed. Its EPSS score was 0.2% on 2026-11-02, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-115823?

CVE-2026-115823 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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