CVE catalog

CVE-2025-56005

ply: CVE-2025-56005

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Jan 1, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 18.81% · Oct 25, 2026

An undocumented and unsafe feature in the PLY (Python Lex-Yacc) library 3.11 allows Remote Code Execution (RCE) via the `picklefile` parameter in the `yacc()` function. This parameter accepts a `.pkl` file that is deserialized with `pickle.load()` without validation. Because `pickle` allows execution of embedded code via `__reduce__()`, an attacker can achieve code execution by passing a malicious pickle file. The parameter is not mentioned in official documentation or the GitHub repository, yet it is active in the PyPI version. This introduces a stealthy backdoor and persistence risk. NOTE: A third-party states that this vulnerability should be rejected because the proof of concept does not demonstrate arbitrary code execution and fails to complete successfully.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	ply	sid	`3.11-12`	vulnerable
Debian	ply	forky	`3.11-12`	vulnerable
Debian	ply	trixie	`3.11-9`	vulnerable
Debian	ply	bookworm	`3.11-5`	vulnerable
Cpe	ply	Not reported	Not reported	unknown
Ubuntu	ply	16.04	`3.7-1`	vulnerable
Ubuntu	ply	18.04	`3.9-1`	vulnerable
Ubuntu	ply	18.04	`3.11-1`	vulnerable
Ubuntu	ply	20.04	`3.11-3`	vulnerable
Ubuntu	ply	20.04	`3.11-3build1`	vulnerable
Ubuntu	ply	20.04	`3.11-3ubuntu0.1`	vulnerable
Ubuntu	ply	22.04	`3.11-4ubuntu1`	vulnerable
Ubuntu	ply	22.04	`3.11-5`	vulnerable
Ubuntu	ply	24.04	`3.11-5`	vulnerable
Ubuntu	ply	24.04	`3.11-6`	vulnerable
Ubuntu	ply	25.10	`3.11-9`	vulnerable
Opensuse	python-jsonpath-ng	tumbleweed	`1.8.0-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ply	source	sid	`(unfixed)`	unimportant	Not reported	Not reported
Debian	ply	source	forky	`(unfixed)`	unimportant	Not reported	Not reported
Debian	ply	source	trixie	`(unfixed)`	unimportant	Not reported	Not reported
Debian	ply	source	bookworm	`(unfixed)`	unimportant	Not reported	Not reported
Opensuse	python-jsonpath-ng	rpm	tumbleweed	`1.8.0-1.1`	Not reported	OPENSUSE-SU-2026:10418-1	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[python3-ply]Affected
Source package: [ply]
Details (2)
- 3.11-5 · all · bookworm
  Affected
  dsa · ply · debian · bookworm; dsa · ply · debian · 12
- 3.11-5 · all · bookworm
  Affected
  dsa · ply · debian · bookworm; dsa · ply · debian · 12
[python-ply-doc]Affected
Source package: [ply]
Details (2)
- 3.11-5 · all · bookworm
  Affected
  dsa · ply · debian · bookworm; dsa · ply · debian · 12
- 3.11-5 · all · bookworm
  Affected
  dsa · ply · debian · bookworm; dsa · ply · debian · 12

[Debian 13 (Trixie)]

[ply]Affected
Source package: [ply-probe]
Details (2)
- 2.4.0-1 · amd64 · trixie
  Affected
  dsa · ply · debian · 13
- 2.4.0-1 · arm64 · trixie
  Affected
  dsa · ply · debian · 13
[python3-ply]Affected
Source package: [ply]
Details (2)
- 3.11-9 · all · trixie
  Affected
  dsa · ply · debian · 13
- 3.11-9 · all · trixie
  Affected
  dsa · ply · debian · 13
[python-ply-doc]Affected
Source package: [ply]
Details (2)
- 3.11-9 · all · trixie
  Affected
  dsa · ply · debian · 13
- 3.11-9 · all · trixie
  Affected
  dsa · ply · debian · 13

[openSUSE Tumbleweed]

[python313-jsonpath-ng]Unknown
Source package: [python-jsonpath-ng]
Details (1)
- 1.8.0-1.3 · noarch · tumbleweed
  Unknown · Fixed: 1.8.0-1.1
  Version impact unknown
  dsa · python-jsonpath-ng · opensuse · tumbleweed
[python314-jsonpath-ng]Unknown
Source package: [python-jsonpath-ng]
Details (1)
- 1.8.0-1.3 · noarch · tumbleweed
  Unknown · Fixed: 1.8.0-1.1
  Version impact unknown
  dsa · python-jsonpath-ng · opensuse · tumbleweed

Observed: Oct 24, 2026, 2:01:02 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]