9.8

CVE-2023-24540: Improper handling of JavaScript whitespace in html/template

Modified
AliasesRHSA-2023:3409RHSA-2023:4420UBUNTU-CVE-2023-24540
Published 11-05-2023Last modified 24-01-2025

Vulnerability summary

CVE-2023-24540 is a critical (CVSS 9.8) vulnerability in go standard library html/template. EPSS estimates a 1.56% chance of exploitation in the next 30 days, higher than 75.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
1.56%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 23 · Related 10
MGASA-2023-0169OPENSUSE-SU-2024:12907-1OPENSUSE-SU-2024:12908-1RHSA-2023:3318RHSA-2023:3319RHSA-2023:3323

Timeline

  1. 11-05-2023
    PublishedVulnerability first disclosed.
  2. 24-01-2025
    Last modifiedVulnerability information updated.

Description

Not all valid JavaScript whitespace characters are considered to be whitespace. Templates containing whitespace characters outside of the character set "\t\n\f\r\u0020\u2028\u2029" in JavaScript contexts that also contain actions may not be properly sanitized during execution.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

1.56%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.56% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat16 products
  • buildah< 1:1.23.4-4.1.rhaos4.12.el8
  • buildah-debuginfo< 1:1.23.4-4.1.rhaos4.12.el8
  • buildah-debugsource< 1:1.23.4-4.1.rhaos4.12.el8
  • buildah-tests< 1:1.23.4-4.1.rhaos4.12.el8
  • buildah-tests-debuginfo< 1:1.23.4-4.1.rhaos4.12.el8
Chainguard11 products
  • go-1.20< 1.20.4-r0
  • katib-earlystopping< 0.19.0-r31
  • katib-suggestion-goptuna-compat< 0.19.0-r40
  • katib-suggestion-hyperband< 0.19.0-r31
  • katib-suggestion-hyperopt< 0.19.0-r40 | < 0.19.0-r31
Wolfi11 products
  • go-1.20< 1.20.4-r0
  • katib-earlystopping< 0.19.0-r31
  • katib-suggestion-goptuna-compat< 0.19.0-r40
  • katib-suggestion-hyperband< 0.19.0-r31
  • katib-suggestion-hyperopt< 0.19.0-r40 | < 0.19.0-r31
Alpine1 product
  • go≥ 1.20.0, < 1.19.9-r0 | ≥ 1.20.0, < 1.20.4-r0
Debian1 product
  • golang-1.19All versions (No fix recorded)
Go1 product
  • stdlib≥ 1.20.0-0, < 1.20.4
Go standard library1 product
Golang1 product
  • go< 1.19.9 | ≥ 1.20.0, < 1.20.4
Ubuntu1 product
  • golang-1.20< 1.20.3-1ubuntu0.1~20.04 | < 1.20.3-1ubuntu0.1~22.04

9 vendors · 44 products

References

25 links
Show all 25 references