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CVE-2026-55629 is a path-traversal/arbitrary local file-read vulnerability in Whistle versions prior to 2.10.3. The temporary-file retrieval handler accepts a user-controlled filename parameter. Its validation logic fails open: inputs that do not match the expected temporary-file naming pattern can be passed directly to file-reading logic rather than being constrained to the temporary-file directory. Whistle 2.10.3 replaces the boolean validation flow with extraction and validation of an expected 64-character temporary-file hash before constructing the file path.
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No public exploit code observed for this vulnerability.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An arbitrary local file-read vulnerability in Whistle's temporary-file retrieval handling. A fail-open validation flow allowed malformed filename query parameters to be passed as raw local filesystem paths. The remediation restricts file access to validated, hash-based temporary-file names and adds authorization to session routing.
A high-severity path traversal/arbitrary file-read vulnerability in the Whistle HTTP, HTTP2, HTTPS, and WebSocket debugging proxy. Unauthenticated remote attackers can supply a filename to the /cgi-bin/temp/get endpoint and read arbitrary files, including /etc/passwd, in versions before 2.10.3.
A path traversal vulnerability in Whistle prior to version 2.10.3 that allows remote attackers to read arbitrary files via the /cgi-bin/temp/get endpoint.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.