zhangyd-c OneBlog HTTP Header redos

published 2025-03-27 19 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-8271

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

A vulnerability was found in zhangyd-c OneBlog up to 2.3.9. It has been classified as problematic. Affected is an unknown function of the component HTTP Header Handler. The manipulation of the argument X-Forwarded-For leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 19 mo ago (2025-03-27)

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/zhangyd-c/OneBlog/issues/35 referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/zhangyd-c/OneBlog/issues/35#issue-2914268214 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P
CNA	4.0	6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

zhangyd-c OneBlog

Classification

Weakness

CWE-1333 Inefficient Regular Expression Complexity
CWE-400 Uncontrolled Resource Consumption

References

github.com /zhangyd-c/OneBlog/issues/35
issue-tracking, exploit
github.com /zhangyd-c/OneBlog/issues/35#issue-2914268214
exploit, issue-tracking
vuldb.com /?id.301470
vdb-entry, technical-description, third-party-advisory
vuldb.com /?ctiid.301470
signature, permissions-required, vdb-entry
vuldb.com /?submit.521813
third-party-advisory, vdb-entry

Sources

CVE List CVE-2025-2833
NVD CVE-2025-2833

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary