CVE-2023-49606
CriticalExploitedPublic exploitA use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0.
Published May 1, 2024 · Updated Aug 12, 2026 · Also known as ALPINE-CVE-2023-49606, DEBIAN-CVE-2023-49606, DSA-5705-1, UBUNTU-CVE-2023-49606
Key Facts
Patch immediately- CVE-2023-49606 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Tinyproxy (Tinyproxy Project).
- It is exploited in the wild, listed in Industry KEV feed since Apr 6, 2026. Public exploit code is available.
- EPSS estimates a 63% probability of exploitation in the next 30 days.
- Fixed versions are available, including Tinyproxy 1.10.0-4ubuntu0.2, Tinyproxy 1.10.0-5+deb11u1, Tinyproxy 1.11.0-1ubuntu0.1~esm2.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
63%
Higher than 99.1% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-49606 brief as a PDF
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Description
A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0. A specially crafted HTTP header can trigger reuse of previously freed memory, which leads to memory corruption and could lead to remote code execution. An attacker needs to make an unauthenticated HTTP request to trigger this vulnerability.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Apr 6, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
40 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| TinyproxyTinyproxy Project | 1.10.0, 1.11.1, >= 1.11.1 | 1.11.2-r0 |
Patched Releases
Tinyproxy
1.10.0-4ubuntu0.2, 1.10.0-5+deb11u1, 1.11.0-1ubuntu0.1~esm2, 1.11.1-2.1+deb12u1, 1.11.1-3ubuntu0.1, 1.11.1-4, 1.11.2-1, 1.11.2-1.1, 1.11.2-bp155.3.3.1, 1.11.2-r0, 1.8.3-3ubuntu14.04.1~esm3, 1.8.3-3ubuntu16.04.1~esm3, 1.8.4-5ubuntu0.1~esm3
Timeline
Publicly disclosed
May 1, 2024
Added to Industry KEV feed
Apr 6, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-416 Use After Free
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49606.json
- advisoryhttps://github.com/tinyproxy/tinyproxy/commit/12a8484265f7b00591293da492bb3c9987001956
- advisoryhttps://github.com/tinyproxy/tinyproxy/issues/533
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2023-49606
- advisoryhttps://security.alpinelinux.org/vuln/CVE-2023-49606
FAQ
Common Questions.
A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0.
Affected: Tinyproxy (Tinyproxy Project) versions 1.10.0, 1.11.1, >= 1.11.1. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Apr 6, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Tinyproxy 1.10.0-4ubuntu0.2, Tinyproxy 1.10.0-5+deb11u1, Tinyproxy 1.11.0-1ubuntu0.1~esm2.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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