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CVE-2026-66338

A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:229ff97fd679d45f0c57e4de5421e7f618a60cbdf7eb8d7a62d2c21511213583
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 5 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"affected","packageName":"libsoup3","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/2

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/3

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/4

Affected products and versions

5 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"affected","packageName":"libsoup3","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/2
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/3
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"affected","packageName":"libsoup","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/affected/4

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.4,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-444","description":"Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-66338"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/references/0
{"name":"RHBZ#2506950","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506950"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b5c017568fc0c6eae5d41c80b283f40256f044d9ac00c010d7b2072e633d4b74 · sha256:2d07ae9e4ea1f8d2… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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