CVE-2025-9556

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2025-09-12. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Langchaingo supports the use of jinja2 syntax when parsing prompts, which is in turn parsed using the gonja library v1.5.3. Gonja supports include and extends syntax to read files, which leads to a server side template injection vulnerability within langchaingo, allowing an attacker to insert a statement into a prompt to read the "etc/passwd" file.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

September 12, 2025

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 1, 2026
Patch available. Sources: github_pr, cert.
cert

VU#949137 - Langchaingo supports jinja2 and gonja for syntax parsing, allowing for arbitrary file read

https://www.kb.cert.org/vuls/id/949137
github_pr Patch Available

prompts: Prompt template improvements and docs expansion

Patch available: tmc/langchaingo v0.1.14-pre.0 (PR #1348 merged 2025-08-08)

https://github.com/tmc/langchaingo/pull/1348

Data Freshness Timeline

(refreshed 6× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 118 total refreshes for this CVE.

  1. 2026-08-06 13:46 UTCEPSS rescore
  2. 2026-08-05 19:17 UTCEPSS rescore
  3. 2026-08-04 15:09 UTCEPSS rescore
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  15. 2026-07-24 16:11 UTCOSV refresh
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  18. 2026-07-23 03:04 UTCEG score recompute
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  1. 2026-07-15 16:57 UTCEPSS rescore
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  24. 2026-06-25 13:49 UTCEPSS rescore
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  27. 2026-06-22 14:25 UTCEPSS rescore
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  48. 2026-06-07 15:24 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-9556?
CVE-2025-9556 is a critical vulnerability published on September 12, 2025. Langchaingo supports the use of jinja2 syntax when parsing prompts, which is in turn parsed using the gonja library v1.5.3. Gonja supports include and extends syntax to read files, which leads to a server side template injection vulnerability within langchaingo, allowing an attacker to insert a…
When was CVE-2025-9556 disclosed?
CVE-2025-9556 was first published in the National Vulnerability Database on September 12, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-9556 actively exploited?
CVE-2025-9556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.6% of all scored CVEs.
What is the CVSS score of CVE-2025-9556?
CVE-2025-9556 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-9556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-9556, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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