[pkg-vuln] CVE-2026-59884 in pyasn1@0.6.3 #604

New Issue

kert · 2026-08-13T06:01:26Z

kert commented

2026-08-13 06:01:26 +00:00

Severity: HIGH
Package: pyasn1 @ 0.6.3
Fixed in: 0.6.4

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is f

Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-59884

**Severity:** HIGH **Package:** `pyasn1` @ `0.6.3` **Fixed in:** `0.6.4` pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is f **Reference:** https://nvd.nist.gov/vuln/detail/CVE-2026-59884

kert added this to the P21: Package Supply Chain — inventory, mirrors, drift, vuln scanning milestone 2026-08-13 06:01:26 +00:00

kert added the quality ci labels 2026-08-13 06:01:26 +00:00

kert commented

2026-08-13 23:42:54 +00:00

Duplicate of #583 — filed by the supply-chain scanner against the pre-fix dependency set. The bump landed in 611a1d6 (aiohttp 3.14.3, pyasn1 0.6.4, cryptography 50.0.0; verified installed) with per-CVE exploitability rationale on the original issue. The next scheduled scan runs against the fixed lockfile.

Duplicate of #583 — filed by the supply-chain scanner against the pre-fix dependency set. The bump landed in 611a1d6 (aiohttp 3.14.3, pyasn1 0.6.4, cryptography 50.0.0; verified installed) with per-CVE exploitability rationale on the original issue. The next scheduled scan runs against the fixed lockfile.

kert closed this issue

2026-08-13 23:42:54 +00:00

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Reference: homelab/stack#604