CVE-2025-63658: A stack overflow in the mk_http_index_lookup function (mk_server/mk_http.c) of monkey commit f37e984 allows at

Q: How do I fix CVE-2025-63658?

monkey: upgrade to newer than 1.8.5. Exact commands for each OS are on this page.

Q: Is CVE-2025-63658 being exploited?

CVE-2025-63658 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-63658 affect?

CVE-2025-63658 affects monkey. Severity is high (CVSS 7.5). A stack overflow in the mk_http_index_lookup function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

Q: How urgent is CVE-2025-63658?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2025-63658 is a high-severity flaw (CVSS 7.5) affecting monkey. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stack overflow in the mk_http_index_lookup function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-01-29
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: monkey-project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-01-29 20:16 UTCPublished CVE record published
2026-06-17 09:53 UTCUpdated Record last modified

monkey-project monkey UPGRADE

Affected: <= 1.8.5

Fixed in: newer than 1.8.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy monkey || rpm -q monkey || monkey --version

2. UPGRADE to newer than 1.8.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade monkey

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade monkey

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-63658?

monkey: upgrade to newer than 1.8.5. Exact commands for each OS are on this page.

Is CVE-2025-63658 being exploited?

CVE-2025-63658 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-63658 affect?

CVE-2025-63658 affects monkey. Severity is high (CVSS 7.5). A stack overflow in the mk_http_index_lookup function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

How urgent is CVE-2025-63658?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-63657 HIGH 7.5 UPGRADE An out-of-bounds read in the mk_mimetype_find function (mk_server/mk_mimetype.c) of monkey commit f37e984 allo
CVE-2025-63656 HIGH 7.5 UPGRADE An out-of-bounds read in the header_cmp function (mk_server/mk_http_parser.c) of monkey commit f37e984 allows
CVE-2025-63655 HIGH 7.5 UPGRADE A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984
CVE-2025-63653 HIGH 7.5 UPGRADE An out-of-bounds read in the mk_vhost_fdt_close function (mk_server/mk_vhost.c) of monkey commit f37e984 allow
CVE-2025-63652 HIGH 7.5 UPGRADE A use-after-free in the mk_http_request_end function (mk_server/mk_http.c) of monkey commit f37e984 allows att

References

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