Apache Traffic Server up to 8.1.9/9.2.14/10.1.3 HPACK-XPACK Header Decoding buffer overflow

Summaryinfo

A vulnerability was found in Apache Traffic Server up to 8.1.9/9.2.14/10.1.3. It has been classified as very critical. This affects an unknown function of the component HPACK-XPACK Header Decoding. The manipulation leads to buffer overflow. This vulnerability is referenced as CVE-2026-58152. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Apache Traffic Server up to 8.1.9/9.2.14/10.1.3. This issue affects an unknown code block of the component HPACK-XPACK Header Decoding. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Apache Traffic Server mishandles integers while decoding HPACK/XPACK headers, corrupting memory. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

It is possible to read the advisory at lists.apache.org. The identification of this vulnerability is CVE-2026-58152 since 06/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/29/2026).

Upgrading to version 9.2.15 or 10.1.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-50204). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Apache

Name

• Traffic Server

Version

• 8.1.0
• 8.1.1
• 8.1.2
• 8.1.3
• 8.1.4
• 8.1.5
• 8.1.6
• 8.1.7
• 8.1.8
• 8.1.9
• 9.2.0
• 9.2.1
• 9.2.2
• 9.2.3
• 9.2.4
• 9.2.5
• 9.2.6
• 9.2.7
• 9.2.8
• 9.2.9
• 9.2.10
• 9.2.11
• 9.2.12
• 9.2.13
• 9.2.14
• 10.1.0
• 10.1.1
• 10.1.2
• 10.1.3

License

• open-source

Website

• Vendor: https://www.apache.org/

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