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CVE-2023-30536

21
FAUCET Score

CVE-2023-30536 is a medium-severity vulnerability affecting slim/psr7 versions prior to 1.6.1, a PSR-7 implementation used with Slim 4. An attacker can inject newline characters into HTTP header names or values, potentially leading to malformed HTTP requests. This could cause application errors, denial of service through remote service bans, or invalid requests when using a PSR-18 HTTP client. The vulnerability has a CVSS score of 6.5 (Medium) with a network attack vector and low impact on integrity and availability. There is no known active exploitation, public exploit code, or significant community discussion, and it is not listed in the KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.6.1CPE matchmatch criteria
cpe:2.3:a:slimframework:slim_psr-7:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.74%
Probability of exploitation in next 30 days
EPSS Percentile
50.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0074 is in the 32nd percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

composerpatch availablevia ghsa
Product: slim/psr7Fixed in: 1.6.1
composerpatch availablevia ghsa
Product: slim/psr7Fixed in: 1.5.1
composerpatch availablevia ghsa
Product: slim/psr7Fixed in: 1.4.1
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-q2qj-628g-vhfwmedium

Insecure header validation in slim/psr7

Apr 18, 2023

References

github.com / slimphp/Slim-Psr7/commit/ed1d553225dd190875d8814c47460daed4b550bb
Patch
github.com / slimphp/Slim-Psr7/security/advisories/GHSA-q2qj-628g-vhfw
Vendor Advisory
rfc-editor.org / rfc/rfc7230
Technical Description