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  4. CVE 2026 61642 squid request smuggling in http transfer encoding
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Back to active CVEs
High · CVSS 7.7CVE-2026-61642

Squid Request Smuggling in HTTP Transfer-EncodingCVE-2026-61642

Answer in brief

CVE-2026-61642 records a High severity (CVSS 7.7) vulnerability in Squid Request Smuggling in HTTP Transfer-Encoding. The current sources do not mark it as known exploited. The current feed maps squid-cache/squid (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 13, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Oct 13, 2026Material review Oct 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps squid-cache/squid (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
squid-cache/squidgeneric>=3.3.0.1 <7.67.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for squid-cache/squid.
  2. 2Review the reported fix. Update squid-cache/squid to 7.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 13, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Squid is a caching proxy for the Web. From 3.3.0.1 to before 7.6, due to an improper enforcement of behavioral workflow bug, Squid is vulnerable to a Request Smuggling attack against HTTP/1.1 Transfer-Encoding. HTTP header parsing (`src/HttpHeader.cc`) accepted the bare` Transfer-Encoding:` identity form, which the HTTP specification prohibits because any transfer coding must be wrapped within chunked encoding. This problem allows a trusted client to perform an HTTP Request Smuggling attack when HTTP/1.1 is used, bypassing security mechanisms that may be in place between attacker and Squid. When there is an HTTP cache operating prior to the affected Squid, this Request Smuggling attack also allows the attacker to poison that web cache and store arbitrary malicious content at any URL for delivery to other clients' future requests. This issue is fixed in version 7.6.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

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  • dataclasses-avroschema allows code injection through record names in generated default factoriesSame generic ecosystem
  • dataclasses-avroschema allows code injection through generated Meta.schema_nameSame generic ecosystem
  • dataclasses-avroschema record documentation can terminate generated class docstringsSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Oct 13, 2026
References
6 linked sources
Open source record