🛡️ CVE-2026-4963 — smolagents

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality low, integrity low, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

• Attack vector: Network — reachable from anywhere that can route to the service.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Attack requirements: None — no deployment-specific condition has to hold.
• Privileges required: None — an unauthenticated stranger can try it.
• User interaction: Passive — a victim action is involved, but not a deliberate one.
• Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
• Integrity impact: Low — limited, and the attacker does not choose what is affected.
• Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2026-4963 is classified as CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'). The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or…

Affected software

CVE-2026-4963 is recorded against 1 package.

• smolagents

Timeline and source

Published on 27 March 2026 and last revised on 13 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
gist.github.com (Web)
gist.github.com (Web)
github.com (Package)
vuldb.com (Web)
vuldb.com (Web)
vuldb.com (Web)
vuldb.com (Web)
vuldb.com (Web)

Other advisories for this package

smolagents has other advisories on record. If you are patching this one, these are worth checking on the same host:

• CVE-2026-2654 (2.0 Low, published 13 Jul 2026)
• CVE-2025-14931 (9.5 Critical, published 29 Jun 2026)
• CVE-2025-11844 (5.4 Medium, published 22 Oct 2025)
• CVE-2025-5120 (9.5 Critical, published 27 Jul 2025)

Same weakness in other software

These advisories are the same class of weakness (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) in other software:

• CVE-2025-3163 (5.3 Medium, published 7 Jul 2026)
• CVE-2024-34062 (4.8 Medium, published 7 Jul 2026)
• CVE-2024-26020 (8.0 High, published 7 Jul 2026)
• CVE-2023-33234 (8.0 High, published 7 Jul 2026)
• CVE-2024-8862 (published 7 Jul 2026)
• CVE-2023-32785 (9.5 Critical, published 29 Jun 2026)
• CVE-2023-39661 (9.5 Critical, published 29 Jun 2026)
• CVE-2025-27511 (7.2 High, published 18 Jun 2026)

Details

Affected Packages

References