5.5
MediumCVSS 3.1 · from VulnCheck
CVE-2026-120251
imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()
imagecodecs · CWE-835 · CWE-835Affectedimagecodecs
FixNo fix listed yet.
PublishedNov 1, 00:57 · VulnCheck
ScoredNov 1 · 5.5 · VulnCheck
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:04 UTC
What we know
No known exploitation. CISA KEV, checked 22:04 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker needs local access to the machine. CVSS: local.
Someone has to open, click or run something first. CVSS: user interaction required.
A successful attack can take the service down. CVSS impact.
Description
imagecodecs 2026.3.6 through 2026.10.10 contains an infinite loop vulnerability in ccitt_fax4_decode_size() that allows attackers to hang the calling process by supplying a crafted CCITT Group 4 stream. Attackers can provide an 8-byte G4 stream lacking EOFB to ccittfax4_decode() or the numcodecs Ccittfax4 codec, consuming full CPU until the process is killed.
From VulnCheck
Affected and fixed versions
ProductAffectedFixed inimagecodecs2026.3.6 – 2026.10.10–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known