CVE-2025-56005

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-01-20. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Elevated

Also known asEUVD-2026-3342 (ENISA EUVD) · GHSA-qc6m-pwr3-g72p (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 19%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
19%
EPSS %ILE
97th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
19% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

January 20, 2026

Last Modified

September 17, 2026

Advisory Details (10)

Auto-updated Nov 8, 2026
🔬 Proof of concept available. No fix on record yet.
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/30/1
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/29/2
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/29/1
Web page🟡 PoC Available

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/28/5
Web page

oss-security - Re: CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/23/5
Web page🟡 PoC Available

oss-security - CVE-2025-56005 Undocumented RCE in PLY via `picklefile` Parameter

http://www.openwall.com/lists/oss-security/2026/01/23/4
Web page

Clarification: Unsafe pickle deserialization in PLY yacc() is RCE (CVE‑2025‑56005) · Issue #1 · tom025/ply_exploit_rejection · GitHub

https://github.com/tom025/ply_exploit_rejection/issues/1
Web page🟡 PoC Available

GitHub - tom025/ply_exploit_rejection: Arguments to reject CVE-2025-56005 · GitHub

https://github.com/tom025/ply_exploit_rejection
Web page

GitHub - bohmiiidd/Undocumented-RCE-in-PLY: Undocumented RCE in PLY via `picklefile` Parameter · GitHub

https://github.com/bohmiiidd/Undocumented-RCE-in-PLY
Web page

GitHub - bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005: Clarification Regarding the Rejection Arguments · GitHub

https://github.com/bohmiiidd/Undocumument_RCE_PLY-yacc-CVE-2025-56005

Vendor Advisories for CVE-2025-56005(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10 ... 3.11-9 (8 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10 ... 3.11-9 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10, 3.11-11, 3.11-12, 3.11-9
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ply3.11-10, 3.11-11, 3.11-12, 3.11-9
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 56× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 282 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 182 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 19% · 97th percentile
  2. 2026-11-13 03:58 UTCEchelonGraph re-scored
  3. 2026-11-13 03:58 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-12 16:32 UTCEPSS rescoreEPSS 19% · 97th percentile
  5. 2026-11-12 02:53 UTCEchelonGraph re-scored
  6. 2026-11-12 02:53 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-11 16:36 UTCEPSS rescoreEPSS 19% · 97th percentile
  8. 2026-11-11 01:47 UTCEchelonGraph re-scored
  9. 2026-11-11 01:47 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-11-10 16:40 UTCEPSS rescoreEPSS 19% · 97th percentile
  11. 2026-11-10 00:42 UTCEchelonGraph re-scored
  12. 2026-11-10 00:42 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-11-09 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  14. 2026-11-08 23:37 UTCEchelonGraph re-scored
  15. 2026-11-08 23:37 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-11-08 16:37 UTCEPSS rescoreEPSS 19% · 97th percentile
  17. 2026-11-07 22:32 UTCEchelonGraph re-scored
  18. 2026-11-07 22:32 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-11-07 16:37 UTCEPSS rescoreEPSS 19% · 97th percentile
  20. 2026-11-06 21:26 UTCEchelonGraph re-scored
  21. 2026-11-06 21:26 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-11-06 16:34 UTCEPSS rescoreEPSS 19% · 97th percentile
  23. 2026-11-05 20:21 UTCEchelonGraph re-scored
  24. 2026-11-05 20:21 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-11-05 16:35 UTCEPSS rescoreEPSS 19% · 97th percentile
Show 75 more
  1. 2026-11-05 15:55 UTCOSV refresh
  2. 2026-11-04 19:15 UTCEchelonGraph re-scored
  3. 2026-11-04 19:15 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-04 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  5. 2026-11-03 18:10 UTCEchelonGraph re-scored
  6. 2026-11-03 18:10 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-03 16:45 UTCEPSS rescoreEPSS 19% · 97th percentile
  8. 2026-11-02 17:02 UTCEchelonGraph re-scored
  9. 2026-11-02 17:02 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-11-01 15:56 UTCEchelonGraph re-scored
  11. 2026-11-01 15:56 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-31 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  13. 2026-10-31 14:51 UTCEchelonGraph re-scored
  14. 2026-10-31 14:51 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-30 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  16. 2026-10-30 13:45 UTCEchelonGraph re-scored
  17. 2026-10-30 13:45 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-10-29 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  19. 2026-10-29 12:29 UTCEchelonGraph re-scored
  20. 2026-10-29 12:29 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-28 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  22. 2026-10-28 11:16 UTCEchelonGraph re-scored
  23. 2026-10-28 11:16 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-27 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  25. 2026-10-27 09:37 UTCEchelonGraph re-scored
  26. 2026-10-27 09:37 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-10-26 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  28. 2026-10-26 08:32 UTCEchelonGraph re-scored
  29. 2026-10-26 08:32 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-10-25 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  31. 2026-10-25 16:17 UTCEchelonGraph re-scored
  32. 2026-10-25 07:26 UTCEchelonGraph re-scored
  33. 2026-10-25 07:26 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-10-24 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  35. 2026-10-24 06:20 UTCEchelonGraph re-scored
  36. 2026-10-24 06:20 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  37. 2026-10-23 16:30 UTCEPSS rescoreEPSS 19% · 97th percentile
  38. 2026-10-23 05:14 UTCEchelonGraph re-scored
  39. 2026-10-23 05:13 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  40. 2026-10-22 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  41. 2026-10-22 04:08 UTCEchelonGraph re-scored
  42. 2026-10-22 04:07 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  43. 2026-10-21 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  44. 2026-10-21 02:57 UTCEchelonGraph re-scored
  45. 2026-10-21 02:57 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  46. 2026-10-20 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  47. 2026-10-20 01:49 UTCEchelonGraph re-scored
  48. 2026-10-20 01:49 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-10-19 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  50. 2026-10-19 00:43 UTCEchelonGraph re-scored
  51. 2026-10-19 00:42 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-18 05:25 UTCEchelonGraph re-scored
  53. 2026-10-17 23:37 UTCEchelonGraph re-scored
  54. 2026-10-17 23:37 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-10-17 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  56. 2026-10-16 22:29 UTCEchelonGraph re-scored
  57. 2026-10-16 22:29 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-10-16 16:39 UTCEPSS rescoreEPSS 19% · 97th percentile
  59. 2026-10-15 19:09 UTCEchelonGraph re-scored
  60. 2026-10-15 19:09 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-10-15 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  62. 2026-10-14 16:31 UTCEPSS rescoreEPSS 19% · 97th percentile
  63. 2026-10-14 12:54 UTCEchelonGraph re-scored
  64. 2026-10-14 12:54 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  65. 2026-10-13 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  66. 2026-10-13 11:48 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-10-12 16:55 UTCEchelonGraph re-scored
  68. 2026-10-12 16:33 UTCEPSS rescoreEPSS 19% · 97th percentile
  69. 2026-10-12 10:42 UTCGHSA enrichmentGHSA-qc6m-pwr3-g72p · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-10-11 20:29 UTCEchelonGraph re-scored
  71. 2026-10-11 18:41 UTCEchelonGraph re-scored
  72. 2026-10-11 15:16 UTCEchelonGraph re-scored
  73. 2026-10-11 13:47 UTCEPSS rescoreEPSS 19% · 97th percentile
  74. 2026-10-10 19:59 UTCEPSS rescoreEPSS 19% · 97th percentile
  75. 2026-10-09 20:06 UTCEPSS rescoreEPSS 19% · 97th percentile

Frequently asked(5)

What is CVE-2025-56005?
CVE-2025-56005 is a critical-severity vulnerability; its CVE record was published on January 20, 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…
When was the CVE record for CVE-2025-56005 published?
The CVE record for CVE-2025-56005 was published on January 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 17, 2026; the record at its source may have been updated since.
Is CVE-2025-56005 actively exploited?
CVE-2025-56005 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19% probability of exploitation in the next 30 days (97th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-56005?
CVE-2025-56005 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-56005?
No fix for CVE-2025-56005 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2025-56005 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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