Low Privilege escalation exploit reference

CVE-2025-61786 — Deno's --deny-read check does not prevent permission bypass

Deno is a JavaScript, TypeScript, and WebAssembly runtime. In versions prior to 2.5.3 and 2.2.15, `Deno.FsFile.prototype.stat` and `Deno.FsFile.prototype.statSync` are not limited by the permission model check `--deny-read=./`. It's possible to retrieve stats from files that the user do not have explicit read access to (the script is executed with `--deny-read=./`). Similar APIs like `Deno.stat` and `Deno.statSync` require `allow-read` permission, however, when a file is opened, even with file-write only flags and deny-read permission, it's still possible to retrieve file stats, and thus bypass the permission model. Versions 2.5.3 and 2.2.15 fix the issue.

Published Oct 7, 2025 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: GitHub_M

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 14, 2026

Affects

Deno

CVSS base

3.3

Low · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — github.com (NIST National Vulnerability Database)
Documented patch — github.com (NIST National Vulnerability Database)
Rust Deno: fixed in version 2.5.3 — github.com (GitHub Security Advisories)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Deno Deno, Denoland Deno, Rust Deno).
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (privilege escalation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Deno	Deno	≤ 2.2.15≥ 2.3.0 and < 2.5.3	Vulnerable	NIST National Vulnerability Database
Denoland	Deno	version >= 2.3.0, < 2.5.3version < 2.2.15	Vulnerable	CVE Program (cve.org) e CISA ADP
Rust	Deno	< 2.5.3	Vulnerable	GitHub Security Advisories

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

Low

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
3.3	CVSS 3.1	Low	1.8	1.4	security-advisories@github.com via NIST National Vulnerability Database
3.3	CVSS 3.1	Low	—	—	GitHub, Inc. via GitHub Security Advisories
3.3	CVSS 3.1	Low	—	—	GitHub_M via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N (score shown at the top: security-advisories@github.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-269 · Improper Privilege Management

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Fix documented
Oct 13, 2026 · GitHub Security Advisories
Affected products added · rust/deno
Oct 13, 2026 · GitHub Security Advisories
Affected products added · denoland/deno
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 3.3
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
2025
CVE published
Oct 7, 2025 · GitHub_M

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 13, 2026 – Oct 13, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

7 on the record

github.com/denoland/deno/security/advisories/GHSA-qq26-84mh-26j9
Exploit, Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
github.com/denoland/deno/commit/1ab2268c0bcbf9b0468e0e36963f77f8c31c73ec
Patch, x_refsource_MISC, NIST National Vulnerability Database
github.com/denoland/deno/pull/30876
Issue Tracking, Patch, x_refsource_MISC, NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2025-61786
GitHub Security Advisories
github.com/denoland/deno/releases/tag/v2.5.3
Release Notes, x_refsource_MISC, NIST National Vulnerability Database
github.com/advisories/GHSA-qq26-84mh-26j9
GitHub Security Advisories
github.com/denoland/deno/releases/tag/v2.2.15
Release Notes, x_refsource_MISC, NIST National Vulnerability Database

Elsewhere on this site

Deno
every CVE for this vendor

Privilege escalation
same class

CWE-269
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-55517 Deno: Denial of service via non-ASCII bytes in WebSocket response headers Jun 23, 2026
Medium CVE-2026-49860 Deno: WebSocket API sandbox bypass via missing post-DNS check Jun 23, 2026
Medium CVE-2026-49983 Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access Jun 23, 2026
High CVE-2026-49402 Deno: Command Injection via spawnSync & spawn on Windows Jun 23, 2026
Medium CVE-2026-49411 Deno Node TCPWrap numeric hostname aliases bypass --deny-net resolved-IP deny checks Jun 23, 2026
Medium CVE-2026-49406 Deno: BYONM module resolution allows `package.json` main path traversal to bypass `--allow-read` restrictions Jun 23, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2025-61786 is "Deno's --deny-read check does not prevent permission bypass", rated Low. It affects Deno (Deno); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 3.3 describes technical severity. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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