CVE-2025-47911 | Quadratic parsing complexity in golang.org/x/net/html

The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

Published: 2026-02-05 Last update: 2026-02-18 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-47911 is rated Low Risk (22.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-47911

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-18 0.06% 0.02% -0.04%
2 2026-02-13 0.02% 0.06% +0.04%
3 2026-02-06 — 0.02% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-47911

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-47911

GitHub Security Advisory for CVE-2025-47911

GHSA-w4gw-w5jq-g9jh · Severity: medium · Ecosystem: go — golang.org/x/net/html has a Quadratic Parsing Complexity issue

OS Trackers for CVE-2025-47911

vendor priority summary link
debian not yet assigned CVE-2025-47911 not yet assigned priority: Debian including 1 source packages (golang-golang-x-net), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. https://security-tracker.debian.org/tracker/CVE-2025-47911
redhat medium — https://access.redhat.com/security/cve/CVE-2025-47911
suse medium CVE-2025-47911 severity moderate: SUSE including 284 source package names (1.1.0-1.4:trivy-0.68.2-150000.1.9.1, 13.2-9.1:libopenssl3-3.1.4-8.1, …), 1141 product×package rows across 103 product lines (Container private-registry/harbor-trivy-adapter, Container suse/manager/4.3/proxy-httpd, … (103 product lines)): Known Not Affected 693, Fixed 443, First Fixed 5. https://www.suse.com/security/cve/CVE-2025-47911/
ubuntu medium CVE-2025-47911 medium priority: Ubuntu including 7 source packages (adsys, containerd, …), 42 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): not-affected 17, DNE 9, released 9, needs-triage 6, needed 1. https://ubuntu.com/security/CVE-2025-47911

Affected software / configurations for CVE-2025-47911

Vendor Product Version Raw CPE
go html < 0.45.0 cpe:2.3:a:go:html:*:*:*:*:*:go:*:*

References for CVE-2025-47911

cvelogic Threat Intelligence