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Advisories

imagecodecs 2026.3.6 through 2026.10.10 Infinite Loop via ccittfax4_decode()

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Severity
medium
Date
Affecting

  • imagecodecs >= 2026.3.6, <= 2026.10.10

CWE
  • CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
CVSS
6.8
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Dilanka Kaushal Hewage (r3vpwnx)
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.

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