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CVE-2026-102342 — Vulnerability in ammonia — CVE Details

MEDIUM

Ammonia: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Published September 29, 2026Updated September 29, 2026Source: osv

Summary

The following SVG will produce a link with a `javascript` scheme. If the user clicks this link, they will run it. ```svg <svg xmlns="http://www.w3.org/2000/svg"> <a> <set attributeName="href" to="javascript:alert('SET_XSS')"></set> <text y="30">Click set</text> </a> </svg> ``` ### Impact Allows stored XSS in applications that allow the `animate` and `set` tags. ### Patches Fixed in 3.3.3, 4.0.3, and 4.1.4 ### Workarounds Do not enable the `animate` or `set` tags.

Advisory Timeline

  • First published September 29, 2026 (12 days ago).
  • Last revised September 29, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update ammonia to 4.0.3 or later
cargo update -p ammonia --precise 4.0.3
Cargo
Update ammonia to 4.1.4 or later
cargo update -p ammonia --precise 4.1.4
Cargo
Update ammonia to 3.3.3 or later
cargo update -p ammonia --precise 3.3.3

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: crates.io (1).

PackageEcosystemAffectedFixed In
ammonia
crates.io
All versions4.0.3
ammonia
crates.io
All versions4.1.4
ammonia
crates.io
All versions3.3.3

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

Frequently Asked Questions

What is CVE-2026-102342?
Ammonia: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.4/10).
How do I check if my project is affected by CVE-2026-102342?
CVE-2026-102342 affects ammonia. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-102342 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.4

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-m6mh-2hw2-555x
RUSTSEC-2026-0213

Related CVEs

  • CVE-2019-15542
    HIGH

    Uncontrolled recursion leads to abort in HTML serialization

  • CVE-2026-102821
    MEDIUM

    Russh: Unbounded memory exhaustion via CHANNEL_OPEN flood during a client-stalled rekey

  • CVE-2026-102820
    MEDIUM

    pageant: Out-of-bounds read / oversized allocation in `pageant` MemoryMap::read via a malicious Pageant agent (Windows)

More crates.io advisories

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