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CVE-2026-23886

Swift W3C TraceContext has malformed HTTP header that can cause a crash

Published: Jan 19, 2026Updated: Jan 26, 2026 Sources: CVE List NVD GHSACWE-20
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 69.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Swift W3C TraceContext vulnerable to a malformed HTTP header causing a crash

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-20

Affected Products

github.com/swift-otel/swift-w3c-trace-contextSwiftURL
Library
OSS Libraries / generic-library
github.com/swift-otel/swift-otelSwiftURL
Library
OSS Libraries / generic-library
swift-w3c-trace-contextswift-otel
Library
OSS Libraries / generic-library
swifturlOSS Librariesaka swift-nio-http2, github.com/vapor/vapor, github.com/pytorch/executorch, swift-nio-http2, github.com/apple/swift-nio-http2
swift-oteloss-projectOSS Librariesaka swift-otel

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/swift-otel/swift-w3c-trace-context/security/advisories/GHSA-mvpq-2v8x-ww6g
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-23886
nvd.nist.gov
https://github.com/swift-otel/swift-w3c-trace-context/commit/5da9b143ba6046734de3fa51dafea28290174e4e
github.com
and 3 more references View all →

Timeline

Published
Jan 19, 2026
Last Updated
Jan 26, 2026

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