HighCVE-2026-96889

Librsvg: use-after-free when xml includes have duplicated entities (CVE-2026-96889)

Published 23.09.2026Last modified 21.10.2026Sources: BSI, OSV, CVE.org, Red Hat, Msrc Update Guide, Hersteller, SUSE, Debian, Ubuntu, pwn.watch, SingCERT

Public exploit

What is affected, what to do

An exploit is publicly available. Update Red Hat Enterprise Linux 10 to version 0:1.0.1-1.el10_2.2, Red Hat Enterprise Linux 10 to version 0:2.57.1-9.el10_2.10, Red Hat Enterprise Linux 8 to version 0:2.42.7-6.el8_10.

Affected: Red Hat Enterprise Linux 10 lt *..0:1.0.1-1.el10_2.2
Red Hat Enterprise Linux 10 lt *..0:2.57.1-9.el10_2.10
Red Hat Enterprise Linux 8 lt *..0:2.42.7-6.el8_10
Red Hat Enterprise Linux 9 lt *..0:2.50.7-3.el9_8.1
Fixed in: Red Hat Enterprise Linux 10 0:1.0.1-1.el10_2.2
Red Hat Enterprise Linux 10 0:2.57.1-9.el10_2.10
Red Hat Enterprise Linux 8 0:2.42.7-6.el8_10
Red Hat Enterprise Linux 9 0:2.50.7-3.el9_8.1

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

7.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.8

CVSS v3

Severity High on the scale from 0 to 10.

Source: BSI, OSV, CVE.org, Red Hat, Msrc Update Guide, Hersteller, SUSE, Debian, Ubuntu, pwn.watch, SingCERT

0.5 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 44.5

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 83.94 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: PoC (publicly reported)
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.8
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.5 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 44.5; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 23.09.2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-416

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

Librsvg uses libxml2, a C library, to parse XML. When librsvg parses an SVG document which has a nested Xinclude, an XML entity declaration with a duplicate name as an existing one can cause a use-after-free error. While libxml2 is expanding an internal entity, a recursive XInclude can parse another document that declares an entity with the same name. Both parses use the same `XmlState` entity map on the librsvg side. `entity_insert()` replaces the first entry, whose `Drop` implementation calls `xmlFreeNode()`. The outer `xmlCtxtParseEntity()` then keeps using the freed 144-byte `xmlEntity`. The included parse should not free an entity that the outer parser is still using. The fix is in commit 8a1b0cd319e9af2d1e9cf878081dd77f227a0504, where librsvg will no longer free xmlEntity pointers that libxml2 is still using.

Source: BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), cvelistv5, redhat_csaf, Microsoft Security Update Guide, GitHub Security Advisories, suse_csaf, Debian Security Advisories, Ubuntu Security Notices, NVD (NIST), pwn.watch, CSA/SingCERT

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Red Hat	Red Hat Enterprise Linux 10	`< 0:2.57.1-9.el10_2.10` `< 0:1.0.1-1.el10_2.2`	`0:2.57.1-9.el10_2.10` `0:1.0.1-1.el10_2.2`
Red Hat	Red Hat Enterprise Linux 6	`—`	—
Red Hat	Red Hat Enterprise Linux 7	`—`	—
Red Hat	Red Hat Enterprise Linux 8	`< 0:2.42.7-6.el8_10`	`0:2.42.7-6.el8_10`
Red Hat	Red Hat Enterprise Linux 9	`< 0:2.50.7-3.el9_8.1`	`0:2.50.7-3.el9_8.1`
Vercel	Next.js	`< 15.5.28` `< 16.4.1`	`15.5.28` `16.4.1`
crates.io	librsvg	`2.63.0-beta.0` `2.61.0` `2.62.0-beta.0` `2.62.90` `2.60.0-beta.0` `0.0.0-0` `2.57.90` `—` `2.61.90`	`2.63.2` `2.61.5` `2.62.4` `2.63.2` `2.60.3` `2.57.5` `2.60.3` `2.57.5` `2.62.4`
rust	librsvg	`>= 2.63.0-beta.0, < 2.63.2` `>= 2.62.0-beta.0, < 2.62.4` `>= 2.61.0, < 2.61.5` `>= 2.60.0-beta.0, < 2.60.3` `< 2.57.5`	`2.63.2` `2.62.4` `2.61.5` `2.60.3` `2.57.5`

Vendors and products

Affected operating systems

Affected operating systems

Linux	debian	librsvg	`trixie`

Weakness classes (CWE)

CWE-416Use After Free
Variant
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Entry at MITRE CWE-416

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

PoC-in-GitHub (nomi-sec)	cybersecurity (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	17.10.2026
PoC-in-GitHub (nomi-sec)	CVE-2026-96889-nextjs-rce (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	16.10.2026
PoC-in-GitHub (nomi-sec)	VectorFreed (opens in a new tab)github.com	PoC (publicly reported)reported, not verified	22.09.2026

References & sources

access.redhat.comsecurity/cve/CVE-2026-96889Vulnerability database, x_refsource_REDHAT, web
bugzilla.redhat.comRHBZ#2539279Issue tracking, x_refsource_REDHAT, web
crates.iocrates/librsvgpackage
gitlab.gnome.orgGNOME/librsvg/-/work_items/1241web
rustsec.orgadvisories/RUSTSEC-2026-0305.htmlweb, advisory
access.redhat.comRHSA-2026:86331Vendor advisory, x_refsource_REDHAT, web
access.redhat.comRHSA-2026:86841Vendor advisory, x_refsource_REDHAT, web
access.redhat.comRHSA-2026:86842Vendor advisory, x_refsource_REDHAT, web
access.redhat.comRHSA-2026:86921Vendor advisory, x_refsource_REDHAT, web
pwn.watchpwn.watch: Next.js out-of-band release fixes two unauthenticated RCEs (SVG image optimization CVE-2026-96889, use cache)pwn-watch
GitHub Security AdvisoriesGHSA-673q-mjm6-r5xr: Unauthenticated RCE in `use cache` functions returning typed arrayspwn-watch
nextjs.orgNext.js Security Update for Upstream Vulnerabilitiespwn-watch
github.comGHSA-2464-fhr4-w9xw: Unauthenticated RCE in Image Optimization API when SVG files are usedpwn-watch
GitHub Security AdvisoriesGHSA-2464-fhr4-w9xw (GitHub Advisory Database)pwn-watch
GitHub Security Advisoriessharp: Vulnerability in librsvg dependency CVE-2026-96889 (GHSA-wq5f-xc86-pv6w)pwn-watch
NVD (NIST)CVE-2026-96889pwn-watch, advisory
github.comNext.js v16.4.1 releasepwn-watch
netlify.comNext.js & React security release (Oct 2026): what to knowpwn-watch
github.comGNOME/librsvg/commit/0bc935e675947e185d42005d3ad93d7cf61bcea9web
github.comGNOME/librsvg/commit/1606574427408baca8203ef723281509a229f9e2web

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

21.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:86842

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/96xxx/CVE-2026-96889.json">CVE-2026-96889</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:86842

Source identifier: secalert@redhat.com

21.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:86841

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/96xxx/CVE-2026-96889.json">CVE-2026-96889</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:86841

Source identifier: secalert@redhat.com

25.09.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: proof of concept, automatable: no

New references:

https://gitlab.gnome.org/GNOME/librsvg/-/work_items/1241

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://gitlab.gnome.org/GNOME/librsvg/-/work_items/1241
SSVC assessment	added	—	{"id":"CVE-2026-96889","role":"CISA Coordinator","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-09-25T17:53:42.623078Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

23.09.2026ReceivedRed Hat

CVSS V3.1: AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness type: CWE-416

Description added or changed

New references:

and 1 more reference

Show 9 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Description	added	—	A flaw was found in librsvg. When processing an SVG document containing nested XML inclusions (Xincludes) with duplicate entity declarations, a use-after-free error can occur. This vulnerability arises because the library incorrectly frees an XML entity that is still in use by the parser. An attacker could potentially exploit this to cause a denial of service or execute arbitrary code.
CVSS	added	—	AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness type (CWE)	added	—	CWE-416
Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/96xxx/CVE-2026-96889.json">CVE-2026-96889</a>
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-96889
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2539279
Reference	added	—	https://crates.io/crates/librsvg
Reference	added	—	https://gitlab.gnome.org/GNOME/librsvg/-/work_items/1241
Reference	added	—	https://rustsec.org/advisories/RUSTSEC-2026-0305.html

Source identifier: secalert@redhat.com

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