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CVE-2026-15337 is a low-severity denial-of-service vulnerability in Django's internationalization logic affecting django.utils.translation.check_for_language() in Django 5.2 before 5.2.17 and 6.0 before 6.0.8. The flaw arises because attacker-controlled language codes supplied to check_for_language() were used as keys in an in-memory cached translation-catalog existence check. By submitting many distinct, very long language codes, an attacker could cause those oversized values to be retained in process memory as cache keys, increasing memory consumption across Django worker processes. The vulnerable input could reach the function through language-selection paths including the set_language() view, as well as other language sources handled by Django. Django mitigated the issue by rejecting language codes longer than 500 characters before any cached lookup and by refactoring the cached existence check into a separate helper.
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A low-severity denial-of-service vulnerability in Django's language checking and caching logic that could allow memory consumption through many long language-code values submitted to set_language().
A low-severity Django denial-of-service vulnerability in check_for_language() where many distinct, very long language codes could consume process memory through cached lookups.
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