CVE-2025-29699: NetSurf 3.11 is vulnerable to Use After Free in dom_node_set_text_content function.

This week

MEDIUM 6.5REMOTEDOWNGRADE

CVE-2025-29699 is a medium-severity flaw (CVSS 6.5) affecting netsurf. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NetSurf 3.11 is vulnerable to Use After Free in dom_node_set_text_content function.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-416
Published	2025-11-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netsurf-browser

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-11-03 15:15 UTCPublished CVE record published
2026-06-17 09:05 UTCUpdated Record last modified

netsurf-browser netsurf DOWNGRADE

Affected: 3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.11

1. Check installed version

apt-cache policy netsurf || rpm -q netsurf || netsurf --version

2. No fixed release: DOWNGRADE to a release before 3.11 (Debian / Ubuntu)

apt-cache madison netsurf sudo apt install netsurf=<VERSION_BEFORE_3.11> sudo apt-mark hold netsurf

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list netsurf sudo dnf downgrade netsurf-<VERSION_BEFORE_3.11> sudo dnf versionlock add netsurf

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-29699?

netsurf: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-29699 being exploited?

CVE-2025-29699 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-29699 affect?

CVE-2025-29699 affects netsurf. Severity is medium (CVSS 6.5). NetSurf 3.11 is vulnerable to Use After Free in dom_node_set_text_content function.

How urgent is CVE-2025-29699?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-45663 MEDIUM 6.5 DOWNGRADE An issue in NetSurf v3.11 causes the application to read uninitialized heap memory when creating a dom_event s
CVE-2024-51317 MEDIUM 6.5 DOWNGRADE An issue in NetSurf v.3.11 allows a remote attacker to execute arbitrary code via the dom_node_normalize funct

References

← Back to latest CVEs