Panda3D up to 1.10.16 egg-mkfont sprintf stack-based overflow

Summaryinfo

A vulnerability has been found in Panda3D up to 1.10.16 and classified as critical. Affected by this issue is the function sprintf of the component egg-mkfont. The manipulation leads to stack-based overflow. This vulnerability is listed as CVE-2026-22189. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Panda3D up to 1.10.16. This issue affects the function sprintf of the component egg-mkfont. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The egg-mkfont utility in Panda3D versions up to and including 1.10.16 contains a stack-based buffer overflow vulnerability due to use of an unbounded sprintf() call with attacker-controlled input. When constructing glyph filenames, egg-mkfont formats a user-supplied glyph pattern (-gp) into a fixed-size stack buffer without length validation. Supplying an excessively long glyph pattern string can overflow the stack buffer, resulting in memory corruption and a deterministic crash. Depending on build configuration and execution environment, the overflow may also be exploitable for arbitrary code execution.

The weakness was presented by Ron Edgerson. It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2026-22189 since 01/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/27/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-1168). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

• Panda3D

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3
• 1.10.4
• 1.10.5
• 1.10.6
• 1.10.7
• 1.10.8
• 1.10.9
• 1.10.10
• 1.10.11
• 1.10.12
• 1.10.13
• 1.10.14
• 1.10.15
• 1.10.16

CPE 2.3info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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